you are too young, how old is this guy? Guys will push boundaries
You need to put boundaries of what is acceptable up front (I'll only kiss or hold my hand or something like that). Or for now, he just sits on the other couch!
Realize this is really hard for guys because it is a physical release thing and they are exploring. Anything intimate triggers desire for more intimate... e. g. a kiss activates him. if it goes too far and stops, he will be in very high pain... pain leads to anger. But this is all mating and reproductive stuff... you aren't ready for that, so put up boundaries and he will probably move on. You have plenty of time in life for all this stuff and not your last boyfriend.
Tell him firmly no, if he does not listen break up with him. Honestly your partner should listen to you and not do things to you when you don't want to. Tell an adult you trust is a good tips too. The way he's acting is not okay