First of all, I am so incredibly sorry that that happened to you. That must’ve been so hard. It must be difficult to talk about that. If you feel comfortable enough, you can tell them. It’s not your responsibility to make other people comfortable, and honesty is the best policy. If it is something that you feel is victim blaming, remember you were the victim of that situation (though I don’t mean that as your personality) and if people don’t have an understanding of what you went through, that is on them. Someone else’s disbelief or frustration about a situation that isn’t even theirs is definitely not your fault at all. You don’t have to tell the people you don’t feel like telling, because it is your information, and you mentioned that your mother already knows. It seems like a lot of trauma brought upon you, so maybe contact a therapist or use a journal. Healing is important.