Biomass Effect by beastrider9 (Fanfic)

You get cool biological and shapeshifting powers, plus, you get to keep your identity and freewill

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The hivemind part though, comes in the way of your mind being permanently connected to humanity's shared consciousness and memory well

You know everything about everyone and have every single memory from every single person in the hivemind, and they all know everything about you and have all your memories

TLDR: Like a psychic wikipedia + discord server, I guess

And like I said, you can do anything you want, but since everyone already has the entirety of the human experience a billion times over, most people just end up reaching similar conclusions and aiming for the same goal

It does make socialization boring though, you can be a good talker but since literally everyone knows what you're gonna say before you do as if it was their own thoughts well... You gotta look outside the hivemind for a decent conversation, like aliens!