Why does he do it like that?

Please, help me.): my boyfriend, who is 17... im 15... kisses me kinda weird.? I dunno, its kinda weird/hard to describe. like, instead of just uno, the usual toung kissing, he does it quite differently...he just like mages my toung, and sometimes like...sucks it? and I dunno, kinda stuff like that. Is that normal for his age orr should I say something about it? Now, don't get me wrong, he is a wonderful kisser other than that. Should I be worried? Help me!!!! What do I say/do?