Sometimes I think that's the problem with being a professional coder. It does require a lot of commitment up front to be considered great or a {insert buzzword here} coder. You tend to avoid other things like socializing or picking up new hobbies.

I'd say pick a group hobby that interests you and try pushing through the uncomfortableness of it being awkward in your mind.

When I was struggling with your very same issue I tried improv. It forces you to have to talk with other people. Another thing I did was Yoga, I think just being around other people makes you more confident around people. Group therapy also helps, hearing other's being vulnerable makes you realize other people struggle with this as well.

You build confidence by being competent someone once told me. You can't be competent in something you never practice. If you never go out to socialize, then you won't really be good at socializing will you?

Everyone has faults and I think today it's harder than ever to recognize that. You may feel worthless and under confident, but so might the other person you'd just never know it. Social media does us no favors in this regard and constantly broadcasts the highlights of people's lives rather than their own struggles. You get the impression that you may be completely alone in your thoughts, but you're not.