Well Fearful Flyer, not being in control is another common one. You can train yourself out of it though by progressive exposure. When you go out in the car, get someone else to drive - and consciously try to relax and trust them. Likewise, you are not in control on trains (which I guess you go on without thinking).
Personally, even though I'm a qualified pilot, I now rather like sitting in the back, knowing the guys (or girls!) in the front have been through such rigorous training and checks that there is nothing I could do better. Standardisation is high in airlines. Most pilots have been instructors and, whilst I have flown with the occasional instructor I didn't get on with, I have never flown with one who couldn't fly very well indeed.
Try to get into non-flying situations where you are not in control and consciously get used to the idea. It should really help on the day.