Do I have a mental illness?

First of all, I'm terrible at listening... I couldn't play a game properly whilst listening to someone, and my thoughts stop me from doing that. I'm very self aware; I put nearly all my concentration in to how I look (I think I look quite ugly, but I keep trying to look good). I lose focus so much that it actually looks like I'm high. My thoughts drift off and I stop listening when in a group. However, because of this focus loss and self awareness, my memory is bad too sometimes (e. g. told to do a task but forget certain things, but then dont do those certain things during a task). Worst of all, I don't have great knowledge, which makes conversation even harder. I actually believe I'm stupid and ugly. I've been called dopey, stupid so many times that I actually believe it. I believe now that its apart of my personality. I don't know how much more of this I can take.
Do I have a mental illness?
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