I have the same problem. But, when practicing, I take only those shots that I'm unsure of. For the most part these shots (extreme cuts, reverse angle cuts, long draw shots, two-three rail banks, off angle combinations, kicks, etc, etc,) rarely come up in a game. But when they do, I at least have a degree of familiarity with them.
Bottom Line: I practice tough shots so that, during a game, I can approach a difficult shot knowing that I've made it in the recent past. I don't ever give up and throw away a shot. It's my game, my reputation, my ability.
Keep practicing.
Play Safe!
John