I'm sorry to hear that you had this experience, which must have been traumatizing for you. Have you ever had a chance to talk about it with a therapist or counselor? Being sexually assaulted can affect you in scarring ways, and it's important that you work through them under the guidance of a professional. Also, just so you know, whether or not, sexual assault never "leads" to homosexuality. That is, you don't become gay because you were assaulted. Sometimes people are gay and don't realize it or deny it, but it has nothing to do with the assault itself. In any case, this is not something you should worry about - if you're gay, you're gay, and if you're straight, you're straight, but the assault itself doesn't make a difference either way. My best suggestion would be to talk to a mental health professional, particularly someone who knows how to work through sexual assaults.