I'm basically an introvert. I've lived most of my childhood with my mother alone with few friends and the ones I had betreyed me real hard at some point. So how come that I'm now founding a startup, speaking in front of a big audience at meetups and have a nearly 60/40 work/social life?

At some point I decided to be more social. Making that decision alone had a huge impact. It took several years though, to implement this decision. Some day I cut off my draining social bounds and found energyzing relationships by simple doing what I wanted to do. I started to reach out and experiment with a lot of hobbies like bow casting and going to board games evenings. I made little steps. E.g bow casting is a sport where you don't necessarily interact with others within the sport, but you have the opportunity to interact about the sport.

A physiologist once told me the neat fact, that being an introvert is just an attribute that does not contradict the skill being socially involved. So it is possible with training and decisions to learn how to be more extroverted. For in introvert this is more exhausting and challanging, but definitely possible.

So today I balance my social life and work by visiting meetups, playing board games and all that stuff that makes me comfortable. There I get to know people with similar interests and similar struggle ;)

At some point the work was just not enough to be happy, I identified my missing social interactions as the root cause so I decided to change that.

On the other hand, don't think you have to be social. Don't think you have to care about everything others expect you to care about. It's bullshit. Don't care about that. Rather ask yourself what you want for yourself. Certainly a social life is part of that, but you alone decide how this will look like. E.g. After I decided hey I just don't give a fuck if you like cuddling your cat and when it's birthday is, several months or years later I started to be interested in these things from my own, not because some dippshit society construct expects me to care about it.

So to wrap up:
Introvert is an attribute, social life is a skill.
Deciding for yourself and giving a fuck about others is key.
It takes a shit load of time. But it works.