Yes, you need an organization which signs your certificate, so it is trusted by default. This is our trust-anchor so we know the certificate presented was validated and is was given only to the website owner.
There are numerous around the world for that.
And if that is no longer offered, you can just not have your certificate signed, which means browsers will complain about it.
But you can trust your own certificate yourself. Or create your own certificate authority which can then give our certificates for the community to trust as their new trust anchor.

You can even not have certificates, but keep an weak form of TLS (no idea if browsers support TLS_DH_anon_*), but its still encrypted and can only be broken by an active Man-in-the-Middle-attack. (which is theoretically detectable later on)
Diffie-Hellman is an awesome key-exchange.