Fat, desperate, and frankly weird boy won't take a hint?

He mistook my friendliness for flirting, and when he asked me out, I decided to give him the benefit of the doubt in an effort to not be shallow. But honestly, I am not physically attracted, he's almost a decade older than me, he has no sense of personal boundaries, he frequently laughs at me condescendingly, his idea of a date is paintball, and his only interests seem to be anime, cars, and...paintball. He talks about himself a lot but will not listen to me talk about my interests.

Also, he has made lewd suggestions implying that he really just wants in my pants. And quite honestly, he'd squish me. I don't want to be mean, but 'I wish I'd never given him my number. I've tried ignoring him, but he continues to try to text and call me, and we're in two of the same courses and often run into each other on campus, and I just don't feel right outright ignoring him in person when he talks to me.

How can I get him to leave me alone???