Welcome to the Club of the "higly sensitive people" (HSPs) ! <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />
Unfortunately I don't know any English-language Forum I could recommend you but I'm active in a German-language community about that. <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />
I don't think that being a sensitive person is a default. At the opposite i think it's a "plus". Sensitive persons have better relationship with other people because they can understand the others with the mind not only with the words.
However it's not the same thing to be highly sensitive and to have a lack of self confidence. The self confidence is something which is hard to get. People have to make a lot of efforts to get it. With the years and the experience of life, most of the people can get a better self confidence because the knowing of themselves is better.
Reading Ubereil's posts i don't think he is unhappy (except the weather problem). I think Ub likes to stay at home playing games on his computer or listening music or chatting in the forum. I think he doesn't really want to meet people or to have a lot of friends. I think he feels different from other people but it's untrue a lot of people are just like him.
About the weather i agree with Ub, a bad weather and short days during winter are quite depressive for a lot of people. Ub i guess you should move in Italy as soon as possible.