No one deserves what you've gone through. But it did happen, unfortunately. Please understand that your experience is valid and that you can be hurt by what happened. Please also understand that you have to keep going, prove to yourself that you are strong, that you are loved. People don't matter in this situation, especially if they're behaving like this, because ultimately you need to take care of you. I know you can do it, remember you may not be ok but nobody is. Be sure to love yourself because that is whats important. 

Ok so like even though I am smart I don't know what SA means. Is it suicide or something?

You should not have gone through that. SA amongst strangers is bad enough, but it's even worse if it's in the family. I myself know how hard it can be, and I feel horrible that you had to go through this. 

Honestly, fuck him. Pardon my language, but he's a horrible person for doing that, and you deserve better. I'm honestly glad he's failing high school.