<human>: This is my first actual relationship, so I'm not sure what the root of my worries are. 

It may be self-esteem, as only of recently have I been a bit more confident in how I look. Sometimes I feel dull, not exciting or fun.
It may be trust, even if I say I do trust her. She's surrounded by guys she sees daily, and I'm not there.

Doubt? Inadequacy? 

We've been in a relationship for 4 months, I've met her parents' and often visited her home before college. No arguments, nothing explosive or violent; a happy relationship.

However, now that school has started for the both of us, with me living away on campus (14 miles, 35 minutes with traffic) and staying on campus aside from the weekends, which I will spend her if I'm not busy.
I worry that she'll lose feelings towards me because I'm not very present and reachable, aside from the weekends. We keep in touch with skype and texting, but I feel that's not intimate and heart-to-heart.

I expressed my worries to her and she says everything will be fine, but it's still lingering I really dislike the feeling, especially because I constantly have negative thoughts about it in my mind.

Could you distill the essence of the text into 1-3 sentences?
<bot>: How can I put myself in a position where I can not worry about her losing feelings in school when I'm far away for long periods of time. First real relationship.