Most of the people about to consider you for something, a project, a promotion, a new team, have already met a version of you, assembled from what other people said and what a quick search turned up.
Why this is not paranoia
Recruiter surveys consistently find the large majority research a candidate online before ever speaking with them, and a meaningful share say what they found changed their decision. Outside formal hiring, the same pattern holds informally, a colleague mentions you before you join a project, a manager describes you to a peer before the two of you ever meet. None of this is unusual or sinister. It is simply how reputational information moves through a network faster than the person attached to it does.
What this does not mean
This is not a case for obsessively managing every mention of yourself, which is exhausting and usually counterproductive. It is a case for knowing that the first real conversation about a new opportunity is rarely actually the first impression. An earlier, secondhand one already arrived, and it is worth knowing roughly what it said.
Where to start
Before a conversation that matters, a new manager, a new cross-functional partner, a project lead deciding who to bring on, ask whoever made the introduction one plain question, what have you already told them about me. Knowing the version that arrived ahead of you tells you whether you are confirming an impression or correcting one, which changes how you walk in.
Getting an honest answer to that question depends on how much you trust the person who made the introduction, which is a judgment only you can make. What this gives you is the question worth asking before you assume you are starting from zero.
There is a specific way to gently correct a secondhand impression without seeming defensive about it, and it is worth having ready before the conversation where it would actually help.