OP, I do think you have a point, although perhaps you didn't put it across very well.
Like me, you are obviously the sort of person who likes an intellectual challenge of sorts in their relationship. It doesn't bother some people, but it does others. I don't think that's any worse than wanting to be with someone who can make you laugh, for example. I wouldn't say that, just because someone's degree isn't as "academic" as my own, that would be a problem: one of my closest friends is a nurse (I'm a law student like yourself) and he has one of the most brilliant minds I've ever known. But, if there is an intellectual gap there and it does bother you, then I don't think you should beat yourself up about it, even though that sounds a bit harsh.
I think the negative comments on this thread are based on the assumption that you are unhappy to be with her "just because she has a nursing degree and you have a law degree". I agree that would be wrong because there's nothing material there, just snobbery. But that's not how I read your original post.
Your personalities have to be compatible - I don't mean that they have to be exactly the same - but the relationship has to work, and if intelligence, academic debate, wit or whatever else is an important foundation of a relationship that works for you, then I think that's fine. You can't force yourself to be with someone if it just doesn't "work" even if your reason for that might seem a little strange to others. Anyway, as you say, there may be other things that are affecting your relationship too and it may so happen that the person you marry has no degree at all, but they may have a different kind of intelligence that is just what you're looking for.