Advice about crushes?

I am a gay teenager, and I attend an all- boys rugby grammar school, which I'm not complaining about! However, I have a massive crush on one of my best friends, who is, in my eyes, not only incredibly handsome but also clever and a lovely person. I suffer from the same anxiety that many teens have, meaning that I think I am not particularly attractive or special, and I want our friendship to remain the same (unless he wants anything more)! Please tell me what to do!