翻译：你不能总委屈自己，有些事是不能退让的

you can't always concede; you should strive sometimes.
上面的怎么不说自己是professional english teacher了？

You can't always defend yourself, you shouldn't fall back sometimes.

you can't always be the underdog, there's no compromise on something.

You shouldn't always submit, there is something that you cannot give in.

You can not own grievances of the total, there are things which can not compromise the

Sometimes you are not supposed to back off,don't always let yourself be hard done by.