I Constantly Worry That I Am A Bother To People

It doesn't matter how much you tell me im not, I will still think I am. I like to give a hundred percent at everything. Rather it be something easy like watching a television series. Or having a conversation. I always tell myself that, oh well you could have done better, you should have done this, that, then, now, next week! Its so stressful but I cant make my mind stop. Its like perfection takes over and tells me im worth nothing and all I am is a bother. Who would want to talk to me? Who wants to be with someone as ugly and dumb as me? Why do I constantly think these things? So if I bother you tell, it may hurt me a bit. But I'll survive. I try not to be a bother but its like no matter who I am around, Im bound to be one.