Self Evaluation

Do you ever chicken out when you have to tell someone bad news? I always do. I'm an extremely sympathetic (or maybe even empathetic) person. I absolutely abhor hurting people's feelings and I cannot deal with confrontation. My life is centered around making others happy way before myself and that gets me into a lot of trouble. No matter what I do, no matter what choice I make, I cannot please everyone, and that always upsets SOMEONE.
There's a saying that goes 'don't make that person a priority when they only make you an option.' Or something like that. I suffer from this a lot. I tend to emotionally invest in someone a whole heck of a lot more than they in me. That gets me hurt a lot.
So how do I change? Do I even want to change? Do I want to become this heartless girl who could care less about other people's feelings? Probably not. Unfortunately. This is somethings that defines me. I am an overly-caring worry wart.