How to get them to f*** off?

There’s a lot of family drama going on right now. My mom had an affair and that resulted in a separation of my parents. Today, I found out that my dad is dating who I consider to be like an aunt to me (though we are not related in any way). So I feel betrayed by both of them. My brother is a f* up who won’t move out, so my parents stress on that. It’s a huge mess and yeah.

My parents are always asking me how I feel. Today, me and my dad were at dinner and he dropped the bomb on me that he was dating again and then he asked me how I felt after. I didn’t say anything, not at all. I think I’ve said about two words to him since then, and that was hours ago. He also said that I can like Stan(not his real name, but it’s the guy my mother was having an affair with) and that I won’t hurt his feelings. Seriously, why would I like that home wrecker?

Anyway, I never answer those kinds of questions. I’ve become some what of a mute around my family, because they are driving me wonky! I never voice my opinion on anything. Yes, I do realize I have problems expressing my feelings to people. I don’t trust my parents, it’s hard for me to trust people and they lost it from all of the times they have lied to my face. The only person I can trust is my best friend , and she is unavailable at the moment.

I am just about ready to tell them all to f* off and leave me alone. It’s getting me angry. How do I let them know that I don’t care to talk about it…or to them in general, without really saying much of anything? Sorry if this question is impossible to answer.

And as a little PS, I am not looking for your sympathy, just advice.

Please&thank you.