I am a victim of this problem but i don't know how can i overcome this problem.I know that saying yes always is not good for me,people started to take me for granted.They are using me for their purpose.But i am practicing to say no to people and i started with me.Some times i think of doing something which will be not good for me at that time i say no to me.I hope someday i also be able to say no to others.This is a very useful post for people like me because we know about the problem but discussed about it with us.Thank you once again.