<human>: Can you give me the gist of the text in a nutshell?

This is my first relationship and everything feels fine for the most part. We started dating sometime early in the summer last year and things have been okay. She seems to be more than happy with me as a partner and feels like we have something really great. I'm inclined to agree except that in many ways we are very different people. I'm a fairly nerdy CS graduate who likes his computers and technology while she is a pretty mainstream person with a casual interest in scifi/fantasy and an aversion to technology. It often feels like we value different things. 
She sees our relationship more being about just being there for each other and doing things like eating, sex, casual socilizing, movie going, and the like as being the primary meat and potatos of our relationship. I on the other hand want to be able to share things with her that we can both get really excited about. But many times when I want to share things with her that I find on reddit or just in general it ends up being one of those "Well I'm happy it makes you happy" things and I guess I am wanting someone who can share in nerdy things with me... 

That said I don't know if this is a reasonable expectation or if I should be happy that I have a girlfriend who cares about me and is at least willing to be supportive if not excited by my interests. 

 Lately she has been pressuring me to decide if I really want to be with her since I have vocalized my trepidation about the relationship a couple times and I don't know what to tell her.
<bot>: Girlfriends great but I'm nerdy and she's not. Would I be giving up something great if I left her?