TAOM, You are not responsible for other people’s actions. You will not be punished because of something that your father does. Hashem does not work that way.
I would strongly urge you to get in touch with Shalom Task Force, or perhaps Rabbi Wallerstein, they are trained in dealing with sensitive matters and they will keep it all confidential.
I don’t think anybody would judge you or think of you differently. On the contrary, they will see you as very strong for having reached out and doing what’s right.
TAOM, you’re very brave for speaking out.
Think about someone in real life to discuss your feelings with. You are in a lot of pain and it’s not healthy to bottle it up. You’re smart and IY”H you’ll get through this. You just can’t do it on your own, because it’s not so simple. Don’t worry about your family’s reputation now, worry about yourself. Speak to someone you trust and who will keep things private.
Good luck.