how do you know about yourself

well in your case, yoi know that you cant tolerate failure, that is the first step. now you observed something about yourself and its up to you as to what you want to do with it. do you want to change it and stop feeling sorry for yourself and getting frustrated or go ahead and simply crib about how you are so helpless and hopeless?? Knowing yourself involves a lot of self observing and interrogation. First start with being true to yourself. sometimes, you might feel or thing something but you don't like that idea and don't want that feeling to exist and you might try to manipulate with your own feelings. try not to do that. hope it helps? :)

I know that I put my foot down whenever I see that something has to stop. I also know that I'm not a pushover, at least not anymore. I used to be pushed around but when I figured out how it works, I don't get pushed around anymore.

I know myself full well. Although there are some who pretend that they know another person but they really don't. These people are a complete waste of time to be with.