How do I ask my boyfriend to stop his childish acts?

Anonymous
he's 18. everytime we meet up, he tries to act like a child. like for example, if he keeps being too sticky to me and i feel too suffocating because im sweating and hot af, I'd tell him to give me some space for a while and he will pout and start giving me that crying face. then sometimes he will act like a retarded kid (no offense but that's what he does). he acts like he's throwing a fit like a child who can't get his toy. then he makes weird noises that a child would do. and he's SUPER clingy, like he can't keep his hands off me for a second. when he acts like a kid and start throwing a fit, i have to literally act like a mom and pacify him by telling him things like "sit properly" because he REALLY ACTS LIKE A KID with those sad baby expressions and all. i think that he thinks it's cute. sometimes it's cute but when it gets TOO constant like once every 5 minutes it's really annoying. and as much as i dont care about how people see me, it's embarrassing when he acts like this outside my school's bus stop where there are lots of students staring at us. how do i ask him to stop this act of his? he's a completely normal person by the way.
How do I ask my boyfriend to stop his childish acts?
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