Your best bet for now is to use some service like nostr:npub1wlx4wqeyzzspw43gk56hlfj4k8ava262let5wvammn8djwx7jx3qp5zy3z IVPN, or Mullvad etc.

Your IP address is visible to the relays you write to.

Consider nostr by default to be a public communication protocol (i.e. not private).