Think positive and be with positive thinking friends who boosts your energy.
Pick a project or hobby that is interesting to you, and work at it. Even if you don’t have great results at first realize that you are doing something new and trying at it is a success of it own. And if it is confidence talking to other people, you can only increase that kind of confidence with practice. And yes that is uncomfortable at first and even down right scary sometimes. But if you practice it gets easier.