Wow, what your uncle said to you was horrible. Encouraging suicide is disgusting.
I don't have any friends myself. Everyone has either stabbed me in the back or wanted nothing to do with me because of my mood swings -- or both. When I'm depressed, i'm just a "party pooper;" when i'm manic, I "talk too much." They seem to hate both sides of me, and they only tolerate me when I'm stable.
Anyway, have you tried joining a support group? Not sure if you've heard of DBSA, but they are a great group to join. People who struggle with mental health issues are often the most tolerant and understanding, and you may be able to make good friends there, which is why I mention that. Also check out NAMI if you haven't already.
I don't do NAMI or DBSA because I am not "out" -- but I would join if I was. I just fear that I won't be able to keep my job if people find out about my bipolar.