Full/ Dearie, I had the same problem. Boy followed me around for four weeks and finally asked me out, but I refused.
But that's beside the point. Now to your problem.
Just ask him for some space, first. If that doesn't work...Idunno. Try to shake him. XD Maybe sit in a different spot for cl*censored* if you don't have *censored*igned seats, or perhaps switch where you eat at lunch if that' make any difference. I tried.
Now, see...I've personally given up on guys until I'm of significant age. I'm on 15, I have time, and I'm sure you do too. They're awesome friends and acquaintances, but anything more or less is just...ugh. I'll be happy to meet the college guys...far away from home...when they're mature. c: