I'm looking for an outside perspective. What should I do? [18M] and [18F]

Hey everyone, I could use some advice from you all. I'm turning 18 next month, and in just a few months, I'll be starting senior college. I’m hoping to find a girlfriend, but there's something that's been on my mind for a while. Back in high school, I had a crush on a girl I'm still friends with today. For me, she represents that classic first love. We still get along well, and while I really like her, I’m unsure if she feels the same way anymore since she refers to me as a "bro" or just a good friend now. The problem is, I never confessed my feelings when we both liked each other. I was too shy to say anything at the time, and the whole "sigma male" trend influenced my thoughts in a negative way. I regret not being more upfront. Even now, whenever I find myself alone or daydreaming, I can't shake the feeling of what could have been with her. I've tried to move on, but I keep circling back to her. There's also a tricky situation to consider. When she started dating someone else, it really hit me hard. I decided to cut off contact, which I realize was a mistake—she wasn't looking for that kind of drama. Eventually, we reconciled. So now I'm wondering: should I finally confess my feelings for her after nearly two years, or should I keep this to myself and maintain our friendship (which I truly value)? I know that admitting my feelings could change everything between us. I appreciate any suggestions you might have! Thanks for reading, and I apologize for my messy writing.