If the memories of the past are coming back to bug you, keep offering them to God and continue to pray for healing. If God can heal the blind and raise the dead, he can heal your memories as well. It may not happen overnight, but trust that he is capable of "making all things new." This healing will not mean amnesia, where you forget everything that happened. But, you can get to the point where you trust good guys, and you no longer play the events over and over in your mind, imagining what you would do differently.
Please do not blame yourself. Certainly, do what you can to avoid bad situations in the future, but do not carry the weight of the past on your shoulders. Your anxiety around guys is understandable, so if you feel safer when other girls are around you, that's fine. I do not think that this fear of even the good guys will last forever. So, how do you get past it?
If you have not talked to an adult about what happened, I beg you do this. Go to a parent, a counselor, a priest, or anyone you trust. Sometimes, depending upon what happened, a little counseling can go a long way to help heal these things. When we keep them secret, and try to deal with them on our own, it's easy to feel defeated. But you are not alone.
Lastly, if you ever feel unsafe, get out of the situation ASAP, find someone nearby you trust, and do not forget to say a prayer to your guardian angel. That's one of the things they're there for, but we practically ignore them our whole lives.