Fake it til you don’t look like an awkward person - level up tov only slightly odd.
Life is life - most ‘adults’ just trying to keep their head above the water.

But to help: find a community - your ideas for new skills are great. Learn to be confident in your knowledge - that help with awkward feelings.
Expose yourself to new ideas and meet new people. Put yourself in situations you hate like: public speaking.

Eventually you will get old and realize that nothing really matters.
You know, that awkward moment you still think before falling asleep: no one else remembers it. (Unless it was really a total cluster fuck - but i doubt it).
Anyhow, good luck! You can do it!