so i still have feeling for a friend who doesn't like me back and she notices somethings up. what do i do?

hi my name is daniel, I'm a college student with a few problems, please take the time to listen if you wish.

i've been suffering from depression for a few years now, thats an important tie bit.

one big driver of the depression (as of late, again, two years there are a few things) is that i've been lonely and finding someone to isn't exactly like flicking a my wrist, especially for me. i don't warm up quick and I'm a bad flirt, also i think i get the reputation as just being a nice guy, but people don't want something more.

but back to the current predicament:

I have a friend, i asked her out (in a weird way, because of prior circumstances, ask if you wish to know about that) and she said no. we were very good friends before and very good friends after. she's the kind of person that you'd want to keep as a friend even after something so awkward.

there in lies the problem though, i really think she is a wonderful person and i still deffinetly have feelings for her. i was thinking they would fade with time, and i think they will still, but little things remind me of how wonderful i think she is and i feel disappointed, because i know i can't be with her. and unfortunately i haven't found anyone else that has captivated me yet, to get my mind off her.

however, now the question is, as I'm depressed currently, what do i do now? she notices something is up, she notices it's worse around her (i feel emotionally bad all around in general). what should i say or do? it's hard to mask and even though she's very understanding, honesty is hard here.