Identifying weaknesses can win you a losing position

This was in a club tournament which is why I didn't resign, and I felt the position was still winnable if my opponent blunders a bishop or maybe 2 pawns.

Nice.

move 7. h3 achieves the same goal while being more annoying than Bg5. The purpose is not to stop Bg4.

I don't like 13. O-O-O, black can't attack on the kingside. 

also queenside castle puts your king and queen and bishop together like a nice bunch of targets