Completely change in social situations

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So Im going into highschool (im a newfag, I know) and I have this problem with social interactions.

See, whenever Im alone, or around really close friends or family, Im an alright guy. Im smart, witty, pragmatic, unapolagetic, charismatic, etc. Im not like some social prodigy, but Id say Im a pretty good guy.

But whenever Im in some social situation, that all changes.

Either I become a recluse, barely talking and just sort of keeping my distance,

Or I become a bafoon. I start saying dumb shit just to keep a conversation going. I becone desperate for laughs making a bunch of shitty jokes way too often. I become clingy and seem pitiful.

This isnt me and I want to be able to behave like my more collected self.

Is this a puberty thing? Do I grow out of it? Is there anything I can do to help it?

Please help, cuz I dont want this shit to continue through highschool.

(14M btw)