that's not healthy.
i was raped in my childhood as well, so i feel your pain.
but first you need to inform your girlfriend about this. she needs to know about something that hectic.
then you need to go see a counselor. because if you really love your girlfriend, you'd find any way to make each other last a lifetime.
it will be hard, but it'll all be worth it in the end for her.
i hope this helps. and good luck! My prayers are with you.