embarassed to be aggressive (and winning)

I used to play VERY tightly and fairly aggressively, but I win quite a bit more now by loosening up a little pre-flop and being VERY aggressive post flop and having many players fold on me (I occasional fold, however).
My problem is a strange one: I feel embarassed for some reason and I'll actually refrain from raising (AGAIN!). This gets to the point where I feel uncomfortable and I think about leaving!
Does this happen to anyone else?