I just can't take it with her anymore

There's this girl right? And I am OBSESSED with her, to the point where she's the first thing I think of in the morning and the last thing I want to think about at night. I've been trying to tell her how I feel but I always stop myself because I became THAT friend for her. The friend she talks to about guys and what to do, so I always stop myself because I think it's just going to be pointless since she's not interested, even though we always have like... I don't know how to explain it well but just those kinda moments and it makes me believe otherwise. This has been going on for months and I can't take it anymore and I'm thinking I just blurt it out or just giving up all together. I'm gonna put a poll and please help me decide