I don't see why you lost a pawn on move 1. I prefer 1...Nf6 in that situation
A Good Checkmate

Here I made a puzzle. This is from the position on move 22.
Hopefully I didn't make a mistake in this...

I think that the main thing you need to focus on now is to protect your pieces and learn to recognize when your opponent leaves his/her pieces unprotected. So, my advice to you is to force yourself into the habit of asking the following questions BEFORE you move a piece:
1. Are any of my pieces being attacked by my opponent and if so, are they adequately protected? (CHECK EVERY PIECE!!!!) Adequate protection means that for every piece your opponent has attacking one of your pieces you should have a piece protecting it. For example, if three of your opponents pieces are attacking one of yours, you should have three pieces protecting it.
2. Are any of my opponent's pieces inadequately protected? In this game there were several pieces you could have taken but you didn't. An inadequately protected piece is one in which you have more pieces (of equal or lesser value) attacking it than he/she does defending it.
3. If I make this move (whatever move you are contemplating), will the piece I want to move be put in danger or will a piece it has been protecting be put into danger?
If you force yourself to go through this process EVERY time you move you will improve your rating dramatically. Sometimes it's easier to just look at chess board for a few minutes and pick a move without really thinking it through and this is when blunders happen.

You got lucky on move 14. White should have taken your pawn en-passant, but instead he advanced a centre pawn. Remember the en-passant rule.
Hey Plasmic, your puzzle has a mistake. The first move where the rook takes the pawn, the knight can take the rook and threaten my queen.
Hey everyone. I've been playing chess for a few months now and I just can't seem to get into the thousands in the ratings. Here's a game I've played. I am black, and I won. Any suggestions are welcome.