Write letters to relatives and friends. Never go to a get together and say that the people aren't friendly. What you really mean is that you didn't go out of your way to be friendly with them. Often people can pick up our coldness and they avoid us. Maintain your hobbies and get some new ones.
Hobbies are fun things to do.
If you don't have a hobby, arbitrarily choose one and stick with it long enough for it to grow on you. Read good books. Radio and television have some interesting educational channels that on occasion can substitute for good reading. Play games and enjoy sports . T.V. often will not.