Let me start off by saying welcome, but sorry you have to come here.
I do wish I had the answer but I struggle with the same problem. One thing that I do is focus on my partner, as long as he has a good experience, then I usually enjoy myself. My sensation problem seems to only occur when I'm with a another person.
You don't say if this occurs during masterbation. For me it doesn't, which leads me to believe it's all in my head. I know I have to work through it mentally, but I think it comes from a lack of trust. When I find "Mr. Right", I do believe it will be a little easier to solve.
I know I've given you a round about answer, but it may help you to know it's something others feel.
If you have any other questions, don't hesitate to ask them here or if you would rather, PM me and I'll answer anything.
I know it's hard to talk about somethings in an open forum, but I promise no one here will be shocked or betray your confidence.
Hope to here from you soon,
Shawn and Ben will always be in my heart....
Happiness is like peeing your pants; Everyone can see it, but only YOU feel the warmth.
Peebles, Ohio WOR alumni, Oct. 2007