Ok man listen to me really. Not to brag but I'm a good looking fit 25 year old that has been in numerous relationships and dilemas like this especially when I was younger so I know how you feel somewhat. First you have to understand how woman work, how they process information. You say she is fairly attractive? Are you attractive yourself? Be honest with yourself. Attractive woman are 80 percent into afftractive men, simple as that, of course every situation is different but the majority of it works that way. So here it is bro, most likely you are not attractive, you are not fit, you are just a casual dude that has been placed in the so called " friend zone ". What makes this issue worse is that you've been in the friend zone since your teens. If you actually confess to her again like before you will literally blow it. This is going to be a 1-2 year plan to get her, it will be worth it in the end when she's yours. If u are not fit, start lifting and getting in shape, I don't mean body building huge but in shape as in when u wear a tank top girls will double take. Start taking care of your skin. Maintain perfect hygeine. Start literally dating and fucking other girls as much u can, this will help your game evolve and you will understand little but important aspects of what girls lust for. Do not show interest in her as you would for a gf, casually ask if she wants to grab lunch or watch a movie mabey 2 times in a month, when you are around her make the conversations about your exciting college life and ocasionally drop in hints of girls u are seeing. The whole point is, she has to make the move first without any doubt in your mind. For example, it's been an year and a half, you have been doing what I mentioned earlier, one night you casually end up watching a movie with her but unlike the other times you notice she's uneasy and awkward. After the movie you are driving her back, right before you drop her off she tells you she has feelings for you and wants you. Bam you fuck her and the rest is history. (base case scenario)...only reason I'm writing this is because I was in your situation my high school and beginning college life. I wasn't fit nor did I have a Brad pitt aura in the beginning, just like u I was friend zoned from a ridiculously hot best friend type. I remained friends with her but i made a vow to myself I would win her in the end. I vigorously worked out, took care of my skin, corrected my bad habits and bascially made sure I looked like a walking specimen. By the end of senior year in hs, i started dating woman and sooner or later they came to me with me for some reason. Fast forward, sophmore year in college I remember sitting down eating some chochlate covered almonds after a night of cardio, I look up in the mirror and it hit me. Who was this beautiful man looking at him self, I then realized I was slowly but surley turning into the man that could sedue any woman, I was the guy girls would stare at when I entered a room, I was the guy moms would cheat on their husbands for. But more important I was the guy that would win over my crush that friend zoned my ass, long story short I ended up with my crush sophomore year...but I also dumped her 2 months after...too many hot girls that I could score...stay strong stay motivated, good luck.

I apologize for the bad grammar and any misspelled words. On my phone.