Should I worry about this guy?

To start off I am now 20. It all started in 6th grade when a boy I never spoke to whispered to another kid that I have "hair on my chest" under my jacket and the other kid replied "how do you know"? This was a totally made up lie for I never had chest hair and no-one has seen my chest. When 7th and 8th grade came it got worse because I had classes with him. He started to make fun of my hair with my old childhood best guy friend while looking directly at me smiling for almost the whole class. He would make a face when I wore long shorts as if thinking who is she to wear shorts and even point out that I was wearing white socks it was so dumb that even other kids would ask him "what?" After middle school I thought I would be rid of him, but then years later at age 17 he came into my at the time work place and again started whispering bad things about me to his girlfriend something about staying away from me while joking about me. Two years later I see him at the store and there he was staring at me smiling. Months ago I saw him while delivering packages and he was staring at me. Everytime I run into him he has something bad to say or stares at me. I never did anything to this guy, but it's pathetic and weird at this point. I'm thinking he's obsessed with me.