Some of this might be that "fishbowl complex" that's been described in other posts around here. We assume everybody's watching us, but the truth of the matter is so many people are paying far more attention to their own selves to notice others as much as we think they do.
I tend to put things on hold, though, because I think I will have *more* fun if I do them thin - going on a tropical vacation, for example.
I recommend that, if you are embarrassed to do certain things in groups of friends, try them alone first or with one friend who you trust, as a "dry run". That way, you can find out how it feels to do it, if there are any obstacles because of weight, and you might discover that it's not as intimidating as you thought.
