Metasploit Over Wan (Anonymity)

I started looking forums about opening a reverse shell over Wan, but in all of them, you had to use your public ip, i mean, your real public ip. So my question is: How do you use metasploit over Wan, but without giving up your real public ip?

I've read something about using a vpn. Although, i don't know if using openvpn with vpnbook is useful for this kind of situations. I'm talking about vpnbook because it's my best option. Please let me know if vpnbook can deal with metasploit over wan or if you know other ways to work this around.

Thank you all.