If you’re interested in encrypting your whole life, or at least parts of it, I suggest you read up on PGP and Gnu Privacy Guard (GnuPG). The internet is full of bad and mediocre tutorials but there are also a few good ones by the Electronic Frontier Foundation (EFF) and by a future boy.
My public key
Below is the public encryption key for Marcel Stör, (my first name at this domain) in armored OpenPGP format. Send me encrypted emails that only I can read!