Should I just break up with him?

I'm an 18 year old female, at my last year of high school and this guy asked me out. He was nice and all and seemed like a good guy so I said yeah. The thing is, he's my first boyfriend. But the next day, he asked me if he could hug me and I said sure... But but he started groping my a*ss. I felt kind of uncomfortable and told him to not touch my butt or stomach but he's still doing it. I admit, I do kind of like him but not love him. I decided to go out with him to chat more and to get to know each other more. I haven't kissed him yet but he wants to. I don't mind but he started touching my butt. 

I'm really reserved, I'm the type that's wants to save virginity until marriage and I'm serious about it but something tells me... by his actions that he wants more. I'm asking you guys bc I'm kind of stupid and new to dating. Any advice is helpful!