At least as a start, set up an e-mail and XMPP/Jabber account with a provider with whom you can use your own domain. That way you can own your own identity while still intercommunicating with others. Should the need arise to change providers, you can do so without sacrificing your network.

Of course Google et al. are working tirelessly to make this not possible (see Hangouts, FB Messenger, etc... all once federated XMPP services, now closed-garden proprietary services).