my friend say I look like this ugly guyand tell everyone if I look like him and call me by the name and I reallly don't care but?

He told everyone in class last year and they started calling me by it and this year I got him and he told two guys so I switched it and now im have the class again because there is no other available class for that period and everytime I by myself I start thinking of it and how he going to tell everyone but then acts like my friend even tough I know he not a friend so I move seats in class and he follow me and I told him to stop and he still follows me in class last year so im like sad that ima have to have him in two week for the new semester ugh how to deal with for six months of school ?? I feel like he messes with my head on a psychology level because my head sometimes think he a friend then im like wait no he don like me and I get like depresses because my heart feals weird all dsy having to think that ima have him for class and he going to be bugging me om how I look him even tough other people have said we kinda look alike and he say no he look like so so its some homeless guys and im like okay I freaking get it shut up about it