I'm in college, as the OP implies, I have a job, I hang out with her on a consistent basis in person as well as over XBL, and if either of us are immature I'd like to say it's her seeing as she couldn't tell me what she had to say in person. She is still in High School after all.

I didnt see anything about college in the OP so by coworkers I assumed when you said you were 18 you were working at like a grocery store. More than likely she wants to date someone in highschool and thats why she's resisting. Or she's holding you as a backup in which case just drop her because thats not fair to you. Just say I can't hide my feelings for you and I can't be friends because I cant torture myself being around you. Then move on or see if she has a change of heart

What I meant was the fact that I have a job was implied in the OP, not that I was in college. But anyhow, I was actually thinking the same thing as that. A friend of mine had talked to her about me not too long before this night and when she was asked about how she felt about me she said "I'm still not sure how I feel about him in a romantic way." So either she made up her mind about me in that short time or she does have some hidden feelings for me that she's not yet ready to reveal. I try not to think about that though, because all it's doing is giving me false hope that we could still be together, and the way things are right now, I think the chances of that happening are slim to none.