Hi, Jake - glad you are reaching out. And, I am so very sorry for what you have been through.

I am no expert, but if you were both young and you were not forced I'm not sure this would qualify under the definition of "rape." Sexual abuse, sexual molestation . . . not sure of the appropriate term. For you, you could have initially been a victim of normal sexual curiosity, but things went on for too long and I suspect that was the root of your anger issues. You probably just didn't have the mental ability at the time to understand it all. You are already several steps better off than so many young men that have been in your position - you have told people, thus not keeping it in which inevitably leads to even bigger issues later on.

So, I have found that a very good way for people to process their trauma is to educate themselves. If you are interested, here are 2 links:
https://en.wikipedia.org/wiki/Sexual_abuse and Inappropriate sexual behaviour: Is it a sign of abuse? - AboutKidsHealth.

If you are unsure if your father knows and want to know for sure without asking him directly, request a copy of the police report. I am sure if your father has been informed, he is probably having trouble coming to terms with it - I would imagine it would be very shocking and dismaying to learn that this happened to his son.

Regarding your stepbrother, it is likely he is a sexual offender and this could have been going on with his other siblings and other children in the neighborhood. It still could be. Of course, I have no way of knowing for sure. Just how very, very unfortunate.

In any case, what happened does not make you gay. This is a common fear boys in your situation have. Remember, this is not something you sought out. You feel dirty because you feel shame for what happened - but, again, your stepbrother instigated this. It is not something you asked for. You were young. You did not have the capacity to comprehend what was really happening nor did you have the capacity to know how to deal with it.

Do you have a therapist to work through this with? It will take support and some time, but you can recover from this, you have it in you to do so.