I'll buck the trend here. I don't feel messed up at all. Married over 15 years to the only person I've had sex with. Our marriage is fine and the sexual aspect I think is pretty decent (although I'm a typical guy and would like to see it happen more often).
At first, the lack of experience was telling but we both lacked it so it wasn't embarrasing. There's been great improvement.
I probably got lucky (no pun intended) in that my wife and I are compatible. Obviously we didn't know that before the wedding and it was a roll of the dice.
I also got some decent advice that if you "take care" of her, its way better for you. Also, it seems to me that on the rare occasions when the subject of sex comes up (and its often the women talking amongst themselves), the folks in my generation and younger who very young kids/not born in the 70s don't even know about the WTS prohibitions regarding certain acts. Either that or they just don't care.
I know many were messed up. I was certainly very awkard with the ladies when I was a teenager but I would have been that way regardless of being a JW.