Move 3 is a mistake. You never want to block your C pawn in that formation.
The reason you played Ne8 was so you can play f5. However, In most cases you can play Ne4 instead than f5. In this situation by playing Nc6 you wasted a tempo which made Ne4 impossible becuase your opponent was attacking that square with 2 piece's. Also Nc6 blocked the view of your bishop which the bishop would of supported an Ne4 move.
I played this game as black, in the final round (round 7) of the texas scholastic chess championships.
The time control was 75m 5s delay. I will post what I remember from my thought process (it was last month)
Please analyze, and comment. I want to improve!