What should I do about my absurd crush on a stranger at school?

Efeiiiii
I have a crush on a senior (17) guy at school. Its been kinda taking over my mind for the past three months of 2020. I don't know him AT ALL, total stranger, literally 0 mutual friends and 0 classes together and all that. He most likely does not know me unless he has noticed my staring at him. I found his insta (we were both private accs) and followed it, he didn't return the favour so I unfollowed after much deliberation ( its school culture to follow back ya know). I am really into him somehow, and I want to get to know him for real. Thing is, I got no balls. He doesn't know me, so we're strangers and he's a senior at school. I don't know how to take the first step and not fail? I've been thinking about gathering my courage and just going up to him and asking for his number but I'm hella awkward and not the prettiest (not ugly but no model def). How should I do it? What should I say as a starter? How do I grow some balls and actually do it? Ajfjsksk teenage hormones are difficult
What should I do about my absurd crush on a stranger at school?
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