What mistakes did I make?

The game didn't insert properly...all it shows is a place-holder.

Now it is fixed.

From the way you've presented this game, I get the impression that it is still an ongoing game, still in progress, in which case it is against the rules to ask for guidance. Unless you clarify otherwise, I'm sorry.

"What should I do now?"

Finish the game.

That's the stupid mistake I made:

Someone please analyse my game.

you were in some bad shape.... i'd say the first mistake was leaving your queen in that side after taking the pawn.  After that,  maybe you could've seen that he was trying to attack the queen and tried to get to the other side or back to the back rank... you may be well behind in getting your pieces out, but you'd still be in the game.

Hello Kaikulimu and thank you for sharing your lost game.

Personally,i believe it is the best way for someone to improve his game,by analysing his mistakes.No matter if the game is won or lost,i believe we should always have to look at our mistakes in order to minimise them and try to get better.

Although i am surely not the ideal person to make a proper analysis to your game,i will provide you some thoughts of what i did and i didn't like of the way you played your game.

First of all,you need to understand what kind of opening you are about to deal with and which is the best possible way to defend it as black.

This is the English opening,which from book lines the recommended line is 1.c4 e5, 2.Nc3 Bb4.Of course,there is no right and wrong at such early stage of the game and every Gm deals it with his own philosophy,...there are just some recommended lines so as to follow a nice development,not necessarily standard moves...

Great Kasparov for instance loved to answer to c4 by g6 and to Nc3 by Bg7...

Now in your game i liked the way you behaved to white's offence,with 8...Qa6,9...b5 or 15...Bc5...

The drawback of your play as far as i am concerned,is that you moved your Queen very early in the game and you had "her" trapped in the a-b files,being unable not only to attack ,but even to defend properly...After 3.Nc3 i think your Q shouldn't be moved in the a5 square...

After this stage,your role was completely a defensive one,which you didn't make a serious blunder i think,but then it was a matter of time for white to gain an advantage if a proper attack was about to follow...

Of course,20...Ne7 was a huge mistake as Nh6 was much better and after an exchange of Rooks or after a different move of white,a6 could be played to try and gain the light squared Bishop...until that stage your material was even...

Anyway,it is impossible a chess game to take place without mistakes,so there is nothing to be worried about and just focuse on improving your game by studying and analysing popular and interesting openings!

I'm not an advanced player or something, but i can tell you maybe a few things about your game. First thing i noticed in your game is that you play your light pieces just to develop them quickly, but you have to ask yourself what the point is when you make those moves.

In this game you develop the wrong light pieces first. After 1. d3(is not a good move from white, why not d4?) ... Nc6  (this move is ok, but in this case it is better to do Nf6 or c6). Now white plays Bd2 and you see now why Nc6 isn't the ideal move your queen is getting tempod and doesn't have a good place to retreat, also future moves like Rc1 gives white a upper hand on the c-line.

Then you play ... Be6 which isn't good =), it is rarely/never good to put your bishop before your center pawns in the opening. White played planless also, but he just made random/standard development moves and now he is already better.

Now you play f6, which is understandable(you try to to secure e5, so his night cannot go there), but the disadvantage is again bad light pieces development... Your night at g8 and your bishop on f8 are now bad too.

7 ... 0-0-0 8. Nd5 this crushes your game. Like i mentioned before, because you played Nc6 your Queen doesn't have many places to restreat from start and now white takes fully advantage from it. From now on the game is totally lost. Anaylysing from here is pointless you better improve your first moves first, before tyring to understand the following moves.

My advice is to try to improve your light pieces development and play another opening perhaps ? This opening doesn't seem to do you right.

Maybe a small advice/trick which works for me. I always give my opponent an extra move virtually, so when he makes a move in my mind he can do another extra move. This way you better realize what his (small) plan is without calculating too much.

you placed your queen in a horrible position, even if you played well after that white would have the upper hand