What should I do if my girlfriend isn’t what I hoped for? Should I break up with her?

She is attractive and I like having sex with her. However, I’m with her because more sophisticated and refined girls I liked rejected me. I don’t feel like having a serious relationship with her and I don’t want to introduce her to my family because she is much younger than me (18) and she is immature. I would really feel ashamed if my parents and siblings met her. I think that the fact that I am not so much into her makes her more attracted to me and more willing to please me, but now I feel there is something missing in our relationship. I don’t imagine myself having a family and children with her.

What should I do if my girlfriend isn’t what I hoped for? Should I break up with her?
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