I think it's worth saying also, although it can feel frightening to think of saying NO, if you actually stand up and do it when the situation requires it instead of being afraid to upset people, it feels really, really good. I find it quite life affirming - and because I know I'm a kind, patient person, which to be 'nice' so much I'm sure you are too, I have faith in myself to know when I'm not being treated right. I'm sure you know it too, so trust that and don't be afraid to stand up for yourself. Saying no or expressing your opinion doesn't have to be confrontational, just simple and straightforward, anyone can do it :)