So, as you see, a self fulfilling prophesy... You'll do worse if you feel guilty about things. We are ALL making mistakes. And those self righteous people who judge, they probably just don't notice their own mistakes. Just because they are not failing in this particular area, doesn't mean they are not failing in some others. It's like Jesus said: you who are trying to get the stick out of your brother's eye, get the beam out of yours first.

You can't do better than you. For some reason people think it's possible, but it's not. When you try, and you do the best you can, that's all anyone can ask of you.

Ignorant people think that just because she/he did it, you should be able to do it. But it's so not true. Some of us are able to do such and such and others are able to do something else. We all have a different set of problems and limitations within our mind and body which constrain us and not allow us to become better. It's not our fault. We just act our what's inside. And if something is missing, well, what can we do? Feeling guilty about it wont' fix it. Again, it's good to remember that ALL do something wrong in SOME area. But people like to point fingers at each other. And as someone else said: when you point one finger at someone, the other three of your fingers are pointing at you...

The best thing to do is to acknowledge your mistake and to try to do better next time and relax. If you can't do it again, well, then you couldn't, right? If you could, you would. So relax. Your job is to try and that's all you could do. You have to accept that some things you simply won't be able to do. If someone says: do this because I can do it. Say to them: just because you can, doesn't mean that I can. We all have different abilities. If you fail in this thing (whatever it is), rest easy. All fail in something.