Time to think for myself...i guess

I start thinking and felt that how come at times I have to be so pleasing to others all the time. I am so afraid that people might get angry,people might this and that to the extreme that I think I am neglecting myself...maybe I should start reflecting. At all times, I am always ok and easy with everything then I feel that some people are taking advantage of me. When I am angry, I cant even vent it 'properly'. I hate the way I am behaving towards matter & people now..its juz simply not me.