Okay, well I am 12 moves in and already I see a few mistakes.
First off, you got your queen out way to early in my opinion. You want to develop your minor pieces and fight for the center. And as of move 12, you have no minor pieces developed and only one pawn in the center.
14. ..Nd7? loses your pawn in the center but you could have captured on a2 with your queen. Your queenside is almost non existant at this point with makes you vulnerable.
Maybe I am missing something but I didn't see the point of 18. ..e4 unless you planned to capture back with the knight.
Well I didn't look very closely at this but from what I saw, the opening hurt you alot in this game and that's something I'd recommend working on a little.
Also, next time when you post a game for analysis, try to let annotate it a little so we can have an idea of what you were thinking and what some of your plans were etc. so we can more accurately help. :)
Please analysis this and tell my mistakes....