I don't want to forgive my parents and maintain a close relationship with them
That sounds like an awful situation. Why don't you want to maintain a close relationship with them?
They've made me feel more than once that they're ashamed of me.
You should try to remain cordial to your family. It's wrong to abandon them and not be close over a disagreement. Talk to them.
I might but eventually I want to break away from them
It's important to remain on good terms with your parents whenever possible. Do what you can towards this end.