Hey man I know exactly how you feel. My stutter has also isolated me quite a lot, I guess I am fortunate in that I don't mind spending time alone. Playing games ,music and reading are things i can do that make me happy regardless of my stammer. My only advice would be to stop caring so much about what others think of you ect... all the points you raised are not problems within your self they are problems with how others view you (family / random people) just stop over thinking. I was like that as a teenager but now I don't really care how people view me and that actually makes things way easier.