Short comings and having it pointed out to you over and over again

Sometimes, I really don't get some people and their actions. I don't understand why people say they want to help when in all actuality they just want to do what they always do. Point and laugh at you. You can try your best and the moment you don't pass and don't fail there their to say that you failed that you don't know what you're doing. They point it out to you and it feels like someone is cutting you deep, the old rubbing salt into your wounds deal. It sucks, it makes me want to crawl into a hole and disappear. I don't like people knowing my business, mainly because the moment something happens there are a what feels like a million people there to point it out to you over and over again. I came very close to hitting someone today, and I'm not like that at all. But when someone repeatedly calls you a failure and has been there calling you such for years you reach the end of the rope, and all you want is for them to leave you alone and stop pointing out my faults. I don't know why it's always the nice people that get the short end of the stick. It's like you can never win no matter how hard you try. Makes you want to disappear, you try and you try and then you try again but you didn't make it the last time. Are they so insecure in their own body they have to make you feel even more insecure in yours? I just want to be left alone, I want people to quit harassing me and saying bad things about me, but that will never happen. I can say it all I want and it does nothing. It takes a lot to get me to the point where if you don't shut up I will turn around a slug you as hard as I can! I'm so tired of being the one that gets picked on that people just seem to hate, I don't get it, what did I ever do to them to deserve that? I hate failing and even when I don't fail but don't pass I feel like I failed and then when other people point it out to me and make fun of me and try to say stuff about me, I just want to run hide, cry and scream. I can't take much more, it's driving me insane to have people know my business and my short comings, I try my best and it's never any good, I'm an extremely private person and when you know my business and you shout it to the world it makes we want to leave and never come back. I'm so done with the stupid people I work with I want to go IA or somewhere where their not. I just want and need to go away for a little while, they wont miss me and they don't need me so why should I waste my time trying? They do fine with out me so send me someplace where someone will need me to help somewhere new where I can start over new, with no one there to point out my mistakes and short comings every chance they get.