Too Nice

Sometimes I feel that I need to be a meanie! When I am nice, it seems that I end up getting the short stick. I try to give people the benefit of the doubt, but they seem not to take notice until I get angry. For example, if I keep my thoughts to myself when upset, the situation blows over until the next time the same situation happens again and then I get highly upset and get angry. That's when that person decides to call me not so nice names for being rude; but they don't notice how upset I am until I'm rude. Oh well, what to do? I don't know.