This queen just took me apart, and i had nothing to do

It seems to me that 6. Bg4 is the one that killed you. 5 d4 dropped a pawn, but you may have caught up with that. Bg4 left your knight hanging and went to attack another piece that was defended. If the white knight was not defended then moving the bishop would have traded knight for knight (but lost another pawn). However, since it was defended you just dropped knight for no reason, then traded a knight for a bishop. You should have moved your knight instead.
8. bxc6 was also bad because it was a naked pawn and led to the fork on your king and rook.
9. Nd7 would have been a better block because your queen still would have been protecting your rook.
By then it was pretty much just scrambling and hopeless.