OP, it will be fine if you get it done, honestly, don't worry about it. It sounds like you have a medical need to get it done, so you ought to get it done.
As for worrying about losing sensation, I don't think it will be a problem. My ex boyfriend was circumcised and seemed to have no problems with sensitivity. From a girl's perspective, I loved the fact that he was circumcised. It looks a lot better and is cleaner. If I end up having any boys of my own one day, I will be getting them circumcised as babies. That way they'll have no memory of it, and it will spare them from having any foreskin problems further down the track.
Good luck with it all!