Analysis Please...

Please tel my mistakes...

Well, on move 7, develop the N-d2 to defend the bishop instead of taking more time to retreat.

Pushing the pawn up on move 15 hurt both of those pawns over there. develop the rooks more while you can.

you lost a center pawn when you offered up the bishops trade on move 16.

Move 19 resulted in a fork. Always watch your pieces for forks. I try to remember how a knight moves: a knight on a black square will always move to a white. Helps me remember not to line up my rooks and whatnot.

After he took one of your rooks, you're definitely on the defense, so move 21 should have taken the knight on e1 then try to strengthen your defense, not go on the offense with your bishop. That's why you later lost it.

After that, it was just a lot of pressure from him, nothing anyone could have done to get out of that, except maybe a GM :)

Hope any of this helps, man.

Looks like overall you let yourself get behind in development with a lot of pawn pushes and then the queen exchange - recapturing with the bishop was the right idea in my opinion, because with your center so exposed, retaining the right to castle would be crucial.

The pawn pushes only served to overextend your front line before a true attack could be mounted with the aid of your pieces. Chasing a knight with pawns will usually do this to your defenses. So, in short, always develop the majority of your pieces and connect your rooks before you go on the attack.

Afterthought - it looks like you let him gain quite a few tempos attacking your pieces with his knights after you attack the knight. Threatening a piece without a clear plan in mind will usually lose tempo; unless you can drive it where you want it to go (the edges of the board) without losing tempo, I wouldn't advise open threats like this. Develop pieces and look for tactical opportunities instead.