Can it be known that I'm going to avoid my family?
It's hard to say. Why are you going to avoid them?
I'm sick of my parents always telling me what I should do with my life
You shouldn't avoid your family, because that will just make them upset. Try explaining to them why they shouldn't try to control your life.
My family should stop talking trash like this to me. I don't care if they think it's a phase I'm going through.
I agree that your family shouldn't speak badly about you, but I don't think avoiding them is really the best way to fix the problem. I think you should let them know how you feel, so hopefully they can change.