We all face what you describe. Anyone who suggests otherwise is probably not being honest.
The one thing that has helped me the most is when I adopted the attitude that "right now I'm shooting at spares so why not try a move on the lanes, because the worst that is likely to happen is that I will still be shooting at spares?"
The upside, if I'm right, is more strikes, higher scores, and less second guessing myself all the way home. My advice is if you have a hunch to try something follow it and see. Realistically, what do we have to lose? Just tell yourself, "it's only 60 feet and I can do this" or whatever gives you confidence to try it.
Incidentally, each time you follow that hunch and are proven right it gets easier to follow it the next time. Pretty soon the doubts that we all have will be turned into confidence, which chases away all fear, and we really tap into the part of the game that separates the elite bowler from the average bowler.