You might read up on Avoidant personality disorder. Also, if you feel unskilled in communicating with others, there are many books available on public speaking, making friends, getting along with others. If you do not want to commit to therapy right now (it is actually very helpful), you would find just reading about these topics interesting and helpful.

You might also consider befriending others who share your interests--either in real life (preferably) or over the internet. It's good to have some friends. You don't need to party every night, but to have a friend to interact with is a very nice thing.

Avoidant Personality Disorder Symptoms | Psych Central