Is my own privacy really "guaranteed" when others use privacy-invasive software and services?

Hello everyone,

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I have a question, kinda, which is stated mostly above. The question is, is it possible to be private, while others aren't?

I mean it like this: I don't use facebook, search only with qwant/SearX and send messages with something like Delta Chat or Briar.

Now let's say my girlfriend, mother, brother and mostly my peers use services like whatsapp, google search and upload pictures with me on instagram/Facebook/you name it.

The company knows now that I …

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