I was that kind of person.
I am sometimes mystified how I managed to get hooked up with my DW of 40 years but I did. Despite my shortcomings (and she had 1 or 2) we stayed together and that is the great thing about both of us being basically passive people.
Her great disappointment was my poor interaction with others. As I gradually realized that I was not about to discover a cure for cancer or something, I developed a need to be liked for my own sake. She was a teacher and started working with autistic children. She started to work on me the same way. So she might say "I know you are a kind person, but if you behave as you did at last nite's party, people will think you are ungenerous". "It is OK for you to think someone's taste in music is boring but you don't need to say so". "It is your sister's birthday soon, I want you to sign this card." Me: Why? DW:" because you need to show that you appreciate her".
After some coaching of this sort, I started to function better for myself. I still got tired of talking at socil events. I learned to find a corner where I could be alone for a time, instead of picking up a book or paper and reading it.
I also learned the value of learning and rehearsing, a number of platitudes suitable to certain events, and using them. They have become platitudes because they are effective, and are what people want at those times.
As I got better and could function alone, I went to more events independantly, and she would say "Remember to practise your social skills".
This went on over years, and may sound patronising, but it was what I needed, it worked, and now that she is gone, I am left in a much better place. I have friends.
Oh, and I wanted to change.