A little Delema

Sophia
So I'm 15 and yesterday was my homecoming. I have this friend who thinks of me more than a friend, but he only likes my body. And I don't like him, I like someone else. But my friend kissed me yesterday and I kissed him back...stupidly...and now he thinks we're "dating". I don't want to date anyone right now cause I think dating is unnecessary at my age, but I don't know what to do now. And I cant really talk to my no about this cause she's super strict and would murder me (not really, but she'd be super upset) so I just needs some advice. How do I tell him I'm not really interested in a nice way??