I am sorry but you are taking things far too seriously. People have always had to "put themselves out there", it's part of living in a society rather than as a hermit. If you don't pull your weight in a tribe, others, not just you, may literally die, every hand counts. Others expect you do that, justifiably. Being judged is always going to be part of living in a society. But that's a good thing, not a bad thing! Learn to take criticism well. Some word someone said shouldn't affect you so strongly. Perhaps that was said by a 13 year old that doesn't know any better. Or by someone suffering from serious mental illness who finds some solace in trying to get other people on the internet disturbed.

Being judged as stupid is of course very harsh, but it's also not wrong sometimes. Do some people behave stupidly sometimes?? Of course they do, we all do. That doesn't make us bad people, and we shouldn't despair because we believe we have been categorized as stupid: we should definitely consider whether it's a fair assessment given the circumstances, and try to do better next time. Very smart people can, and do, behave stupidly, specially when talking about religion or politics. Even smart people can say the most stupid things. I think no one is very smart or very stupid in every context, there's always a context where you'd look totally stupid even if you're Albert Einstein. Imagine Mr. Einstein trying to hunt in a jungle in Africa. Even with practice, he'd probably never get good at it. His very way of thinking, very scientific and evidence driven, what we consider intelligent, would get him eaten in no time over there. What count there is being fast thinking, acting on instinct... that's how you survive there, and that's what you would count as "smart" if you lived there.

Anyway, hope some of what I say here helps someone :).