Am I overreacting??????

OK so im 16 and this 20 year old guy asked me out.we met each other and each others work and he asked me to go to the movies. I dont know what came over me and i just decided to do it. I had to sneak out to see him and it was too late to see a movie. We basically just drove around town. And we made a bet thing and if i lost i had to kiss him. We ended up making out. And thats the first time i had madeout with anyone. But then after that it seemed like thats all he wanted to do is just make out then when we made out again he started touching my boobs and my crouch and tryed to suck/kiss my nipples. Then he took me home. He has been texting me and asking me if im busy. But i feel hes just using me for sex. He is not a virgin and he knows i am one. He also sometimes smokes weed and partys and i dont. Also im leaving in a couple weeks to move back to my moms and he knows this. I know all guys want sex but i think he just wants to get my pants off and nothing more. Am i wrong? SHould i go out with him one more time?