help plz

http://bgunstopable.hit.bg/bg_unstopable%20vs%20someone%201-24-2007.PGN

plz tell me my mistakes me white ! thx

3.c3 is a bad move, black can play 3..d5 and recapture with the queen because the c3 square is occupied by the pawn.8Nf3, 8.Ng6 looks better, it misplaces your opponents rook and wins the bishop pair 9.Be3 is bad, there is no need to allow black to double your pawns, i would probably play Bc4 and 0-0 next move 10Be2? why not capturing the free bishop on c5?Instead of 13.Nc4 13.Bg4 is much better winning a piece.I lost interest at this point sorry.