What are things that just make you insecure/uncomfortable for no reason at all? Everyone has a button hidden, somewhere.
The only thing that really does it for me is wearing glasses. I know it's dumb and it doesn't make sense, but that's the thing that does it for me. Probably because I got a lot of shit for it when I was a kid. I'm normally very outgoing and sociable, but when I'm wearing glasses, a lot of my confidence just goes away. Especially around women, even though I've been with several hot women who told me they think it looks sexy on me. It's fucking stupid, but I can't seem to get rid of it.