How do I get a creepy guy to leave me alone?

So there’s this kid at my school who won’t leave me alone. He found me on Instagram or something I guess a few months ago and kept messaging me and wished me a happy birthday even though he had never even met before so I blocked him because I was getting way too creeped out by him. Then a few days ago he comes up to me like “Seila? I didn’t know you went here!” and proceeds to try to talk to me even though I’m very clearly trying to read my book in peace. Then, yesterday, he comes up to me THREE TIMES even though all I say in response is correct him on how to say my name. He also blocked my path to the bathroom to ask if I wanted to meet his friend, which of course I don’t because this guy already creeps me tf out, so why would I wanna meet his friend? Any ways, how do I get this guy to leave me alone?

How do I get a creepy guy to leave me alone?
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