Career and academic success and love have little to nothing to do with each other. I say "little to nothing," because I'm sure you sig. other wants you to fulfill your potential, whatever that might be. Believe me, it takes a lot of us a long time to find out what we want to do with our lives.
Incidentally, these days women seem to be having much more success career-wise than us men. The statistics are quite staggering when you look at them. The proportion of female college students - as well as sucessful graduates - is growing significantly. So much so that people have labelled this issue "the boy problem," and that sort of thing.
If you care for one another, that's enough. Having said that, if you feel insecure, try to figure out what you want to do. It's a big world out there with plenty of options, and if you don't succeed at something, try something else.