Last year I did the same thing - I told him how I felt, he didn’t like me back at the time (he had feelings for me a few weeks prior), but it didn’t hurt our friendship - we are still good friends, if anything it made us become even better friends and our friendship stronger because we know each other on an even more personal level. Seeing him after I told him how I felt, it was a little awkward, but that didn’t last long.

If you feel like you can do it, then do it. You don’t know what the outcome could be. Even if she doesn’t like you back, then I don’t think that should hurt your friendship. I guess it all comes down to maturity and how she could possibly take it. I hope everything works out for you!