You played the first few moves well. Qd2 was weak because you hadn't developed all your minor pieces yet. Later in the game you were just dropping pieces so I'd suggest practising some kind of 'blunder check' before you move:
Ask yourself if there are any undefended pieces which can be captured just before you move. If there are, decide what to do about it!
Don't play so aggressive in the opening. It will only work if your opponent blunders. Just get your pieces out sensibly and start to attack once you've developed properly.
And don't play a2 first move lol
Give enough focus to each part of the game when you study and review. Have a look here if you want a view on a study plan: http://becomingachessmaster.com/study-plan/
I play so aggresive at the beginning, but in the middle and end game, im horrible. please give me tips so i can improve on my game.
here is one of my games:
http://www.chess.com/livechess/game?id=1117470290