This is my first time dating a white guy and he's really into pda?

And he's really touchy feely with me, for example say I'm at my locker he'll come up behind me and put his hands on my and kiss my neck. And before his basketball game today he asked for kiss and I gave him one and I was wearing sweats so he put his hand down my pants and he was like it. And he whispered in my ear I can't wait to take off that thong. And all I said was ok baby bye, and he slapped my when I was walking off. And I could here all his friends giving him high fives. He's so into pda when I went to dinner at his house under the table he put my hand on his crotch, and he sent me a txt saying "this is ***** is going in you". We've been together for 3 months,how do I tell him to calm down with the pda, especially infront of his friends/family....