I just got annihilated can anyone help me spot how and why please?

You neglected to castle and opened up your kingside. When mate was threatened on move 13 (14..Qf2#), you made a sub-optimal response allowing free access to the f2 square, which led to your demise.

Some questions and comments from a player closer to your rating. 

What was the point of 5. c3? Was this just to support d4? or did you have a purpose to that move?

Why 7. Ng5. I would continue developing before jumping into the attack with just one piece.

9. g4 is just throwing away a k-side pawn. I don't see any upside.

10 .. Qd6 Now I think you are winning!! Simply take the Bishop for free with your f-pawn. I think taking with the N is where it finally went sour for you.

Yeah, 7. Ng5 looks like a lemon. King still in the center, Rooks still stuck in the corners, Bishop still on f1, Knight passively placed on d2... don't you have better things to do than launch a one-piece attack?

Opening Principles:

1. Control the center squares – d4-e4-d5-e5
2. Develop your minor pieces toward the center – piece activity is the key
3. Castle
4. Connect your rooks

Tactics...tactics...tactics...

The objective of development is about improving the value of your pieces by increasing the importance of their roles. Well-developed pieces have more fire-power than undeveloped pieces and they do more in helping you gain control.

Now we will look at 5 practical things you can do to help you achieve your development objective.

They are:

1. Give priority to your least active pieces.

• Which piece needs to be developed (which piece is the least active)
• Where should it go (where can its role be maximized)

2. Exchange your least active pieces for your opponent’s active pieces.
3. Restrict the development of your opponent’s pieces.
4. Neutralize your opponent’s best piece.
5. Secure strong squares for your pieces.

Don’t help your opponent develop.

There are 2 common mistakes whereby you will simply be helping your opponent to develop:

1. Making a weak threat that can easily be blocked
2. Making an exchange that helps your opponent to develop a piece

Pre Move Checklist:

1. Make sure all your pieces are safe.
2. Look for forcing moves: Checks, captures, threats. You want to look at ALL forcing moves (even the bad ones) as this will force you look at, and see the entire board.
3. If there are no forcing moves, you then want to remove any of your opponent’s pieces from your side of the board.
4. If your opponent doesn’t have any of his pieces on your side of the board, then you want to improve the position of your least active piece.
5. After each move by your opponent, ask yourself: "What is my opponent trying to do?"

My thoughts (no genius and no computer analysis, just a little bit better than you):

1.  Move 6.  His bishop is attacking yours.  Either you take and mess up his pawn structure, or he takes and messes up yours.  You should take especially since allowing him to take weakens your center as well.

2.  Move 9.  g4?  Now look at your pawns.  They are all away from home, and your king is exposed and has nowhere to hide.  that is the surest way to get annihilated and like you said, you did.  Keep your king side pawns home and castle so your king hides behind them. 

3.  Move 10. f3.  Leaving your king even more alone and vulnerable.  

4.  Move 11.  Nxe4.  You could have won material by taking with the pawn instead of the knight. 

5.  Move 14.  Your opponents queen  and knight are on your turf with no pawns between your king and them.  This should set off alarm bells.  Your only thought should be to play defense.  Qd3 did nothing for you.  Qf3 on the other hand would force a queen trade (since the queen would leave the knight hanging if she ran away).  When your opponent is attacking, try to trade off his attacking pieces for your passive ones.  

I like it, but exciting is not the word i would use.

If it has to be vanilla, it has to be real vanilla bean ice cream.  And fruit does not belong on ice cream.  Ill take real vanilla bean ice cream, chocolate syrup, chocolate chips, and almond slices.

You guys are minor league...

The OP was playing the London system, and 5. c3 is a normal part of that opening. And yes, among other things it supports d4. It also has other purposes that are less obvious.

That said, after 5.... Bd6 leaving the White Bishop on f4 is a mistake. Things go downhill from there. Nbd2 has been played in this position, but it has a pretty miserable record.

As for IM Bacon and his preference for c4 over c3, c4 IS played in some lines of the London. And in fact it is the more common move in this line. However, c3 is playable.

Actually, Ng5 isn't all that bad, since he may try to provoke h6, and supports a future e4 advance. On the other hand, g4?? pitches a pawn. Fortunately, Qd6?? gave you a winning position after fxe4. But instead, you played Ndxe4?? and lost shortly thereafter.

beware of 'vanilla'

https://en.wikipedia.org/wiki/Castoreum

Very very grateful for your replies.  I will take note.     Apart from the ice cream comments!  (You're the one shopping for vanilla)! This is probably the best post I ever made on here and better than many lessons I've had.  Thank you for your knowledge and not being too condescending (ice cream aside!). 

Ng5 served absolutely no purpose and exposed your defence

Frozen yoghurt / yogurt tastes the same and costs less. Give it to your kids and keep the vanilla for yourself.

7. Ng5 was not a good move, but those of you who are in shock over the horribleness of it are overreacting.  the problems got much, much worse after that move.  The computer shows that the game went from even to -0.75 after Ng5.  Not a big deal.  

Don't use 1.d4 at your level. As easy.

Let's appreciate for a second that despite suspicious moves like 7. Sg5 and 9. g4, the OP was still winning after the awful 10...Dd6, which blunders a piece. The simple 11. fxe4 has white with a nice advantage even with the weakened kingside pawn structure that follows after 11....Dxf4 - but admittedly an advantage that could very easily be squandered.

-0.75 is almost a winning advantage for the other player. So even game to winning for the other player. Ng5 makes no sense as a move, violates all principles. When you put yourself in bad positions you will make bad moves. Here you have a neutral position, where he just ruins his own position while also violating basic rules.

<SIGH>...A .75 advantage is not "almost winning" when the game is between players rated 900 and 1000.  This is why this blind trust of what an engine says is so painful, and...well...wrong.