Nope, when I'm on a heater, I feel confident in everything I do. I feel like I'm going to win every flip, every key pot, and am flat out on my game. Of course in the back of my mind I know this isn't possible, but it isn't something that affects my play.
I've said before when you are thinking to yourself I'm going to lose, you are probably better off not playing and walking away from the tables. Mentally playing with the mentality that you are going to lose WILL affect your play, no doubt about it. Sounds like you just have to work on your mental game which is just as important in poker.