We've been to Disney 7 times, and I want so bad to be able to step out of my box so that I can see the story behind the ride.......
First off, be sure you understand when you're dealing with "control issues" and when it's something else. I have major control issues -- but I also have issues with nausea. I'd like to knock it off on the control issues front, but I don't want to take any chances with the nausea one! Some people just don't like loud noises, and although they may have related control issues, all the effort in the world isn't going to make those loud noises any more pleasant for them. I don't like getting slammed around because I have been in pain for the rest of the day; people may call it a control issue, but I just seen no point to being physically miserable for the sake of a few minutes on a ride (although I might do a ride I considered marginally risky late in the day when I knew I could just go home after). And so on.
You can also experience a fair percentage of the "story" with some rides by ducking out the "chicken gate," if you haven't -- and doing that can also tell you something about whether the story appeals to you enough to make the necessary compromise to ride it.
Research helps control issues considerable -- watching a "ride through" video on
youtube, finding out everything you can about the ride on the Dis, and just generally getting a pretty solid idea of what the ride entails can all help.
If you've been to WDW seven times, you're likely going again -- why not tackle one single ride your next trip? Figure out which one most interests you and give that one a chance. If you've got control issues, the first time on any ride you're wary of may not be enjoyable -- but the second one, after you really know what you're getting into, might be, because you're more able to relax enough to get the appeal.
Finally, I agree with the first poster who said "don't push yourself." Sometimes "control issues" keep people from things they'd enjoy if they could just relax, in which case pushing yourself to enjoy it is counterproductive. But sometimes people who have "control issues" also just don't happen to like rides that appeal to most other people, so don't feel obligated to try a ride just to battle your control issues. I'll do rides with my kids I would never do on my own, but those are rides I can "take or leave." But if I really dislike a ride, for whatever reason, I'm not going to ride it. After all, I'm on vacation, too!
I would "push yourself" just far enough to try one ride that really appeals to you, and see how that goes. If you aren't crazy about it but didn't really hate it, try it again. IF not, you've still pushed your personal envelope a bit.