• Find an decentralized network app, such as WireMin.
• Set-up a username and password (does not require personal info)
• Click discovery and create space (Chat or Feed).

Now you just set up a private space on the internet for $0

Am I at the wrong Lemmy?

If you are looking for P2P structure, WireMin is the right place for you I think. http://wiremin.org/

WireMin stands firm on a P2P decentralized network structure to resolve these digital issues: epitomizing data privacy, freedom of speech, and censorship resistance.