You have a choice to make friend, give up a satisfying sex life to stay with her or leave and find a lady who loves to do all the things you are missing out on. And saying she's repulsed by me is a stretch. How did she explain that? If you are ejaculating prematurely—before you want to—you should know that this is quite common as well. If your goal is to be able to focus on your girlfriend and your own physical pleasures while also controlling ejaculation, then distracting your mind takes you further away from that goal rather girlfriend control my cum toward it.
Your to young to deal with that BS drama. Sex is not just about the physical aspect, it is a part of who you are, it is a part of your soul. Look for a healthier relationship.
Please feel free to message me. The first question to ask is whether or not you are actually ejaculating. And blowjobs aren't ideal because she refuses to swallow I'm not allowed to come in her mouth at all.