Hi..personally I think big girls are very sexy. I've always cum very quickly when I've been with one...it's amazing!
I understand that you don't like it, though, and also it's usually hard on your health to carry lots of extra weight. I'm not sure if this is a place where you can find the sort of help you need; we're all pretty busy masturbating, and even though we would want to help, we may not know what to do.
Pam, a lady who runs a forum for hairy women, is also big, and has some sites for big women; she would be a friendly and understanding contact. You can find her at
www.hairychat.com