Hi Yoghurtz, I'd say that your reasons for wanting a vasectomy are so well considered. You've obviously put a lot of thought and feeling into your considerations. And whether you want to do this or not is your decision, you can't make major decisions such as having/not having children around what other people want.
BUT you ARE only 23 and if you consider that SO much will/might have happened for/to you in the next 7....10.....15......20 years. We're talking big chunks of time here and people's feelings, beliefs, values, wishes can change so much with different life experiences over time.
I'm not going to say this will absolutely, definitely change for you (no-one can!) but I'm just saying give yourself a chance, and give the person you may become at 30...35..... a chance too to just have that opportunity to say "Yes, actually........you know.....".
And you know, part of this decision is based on the hurt you've experienced in the past, which is absolutely understandable. So maybe bring the attention back to you and get some (more?) help in dealing with/addressing what you've been through. It sounds like it must have been really painful for you and still has to be deep down. Give yourself the chance to be able to live the life you want to without it/your decisions being tainted as much by what went on for you. YOU deserve that!!!
Best wishes
Alison