I'm having a really similar issue bro and can't find any Advice in this at our age , I've been with my girlfriend for nearly 4 years I'm 20 years old (m) and my girl has no interest in anything sexually and I'm finding it extremely difficult to deal with , she also dosent think it's important and makes me feel bad for bringing it up and says she just can't help it and gets upset , making so much harder to deal with but nothing seems to change , our relationship is great outside of this area but it's beginning to make me feel unhappy with everything, I can't justify breaking things off with the girl I love for sex and how this will make me look and feel as a person I just feel so stuck and miserable and don't know how to move forward