I don't know what to think of my boyfriend anymore

We've been dating for 5 days and at day time he's so fucking perfect. He likes that I'm goofy, that I'm childish, we can talk to each other about everything.

But sometimes at night he gets like this. And I am uncomfortable with being freaky. I'm only 13 and he's 15. He says that since he took me this way he doesn't want to change me but I still don't know what to do.

Am I just being stupid?? ☹️

Ps. It says kaylas boyfriend but thats just for my mom doesn't catch me having one, he's really mine

UPDATE.

I broke up with him. He confessed that he was cheating on a girl and I was his side hoe. So i dumbed him. And i feel great. He can't hurt me. And he's just a child

He can get a bitch pregnant

That's not my problem anymore 😂