I’m like this but not happy with it. If you are happy then don’t worry about it and don’t try to change to fit into some sort of societal expectation.
It might be worth trying to figure out where it came from. For me, I was the only child living at home to older parents, one who was very strict, controlling and unpredictable, the other who was emotionally very distant and not around much. Addiction was very present in our dysfunctional family and from around the age of 2 I knew I had to put on an act around other people, keep secrets and pretend we were normal. Our lives were secretive and insular. My parents didn’t have friends and other family members mostly lived in other countries and rarely visited. Keeping people out was what we did. I started getting bullied around the age of eight and that carried on until 15. A lot of it was girls pretending to be my friend then telling all my secrets/making fun of me.
Through that I learned the only person I could trust was myself. I started spending lunchtimes in the library or school toilets and rarely socialised outside of school. I eventually did have a good friendship group but found, and still find, socialising draining and nerve wracking.
I don’t think I am naturally an introvert. I long for connection and a big, happy family. I became introverted because it was the safest thing to do.
I have a couple of not too close friends. I see them every couple of weeks. I’d love to have a boyfriend or husband even but I’m too nervous about spending time getting to know complete strangers so I don’t dare to try online dating. I’m lonely most of the time.
People do want to be my friend but sometimes I push them away. Like you, I prefer to take lunch alone and would make an excuse that I’d forgotten lunch and needed to go and buy some to colleagues and then go and eat in the car or in a cafe alone.
My way of thinking and being is dysfunctional and unhealthy. Loneliness is actually a killer, those who are lonely have a much shorter lifespan. I am having counselling and working through trauma in the hope that one day I will get over it all and get my dream of being connected to others and letting them in.
If you think what I’ve said resonates with you (and I really hope it doesn’t) - get help! But if you are truly content in your own company, and many people are, enjoy it! You’ll never let yourself down.