Unfortunately, I'm mostly offensive. But I don't have the skill to match my style.
I tend to try too hard and go for too much when at my level (3.0) I just need to get the darn ball back over the net and wait for them to make the mistake.
I'm trying to learn to be more of a defensive player. I start out my matches by telling myself, "You don't have to win the match on the first point." I tell myself (after I've sprayed one too many returns) "Just start the point!"
I am trying to learn to wait for the set up to try to hit a winner rather than forcing it (which almost never works for me).