I think the key is not falling prey to popular notions of what the word 'introvert' means. Very few people are introverts across the board. As you note, you you

I think the key is not falling prey to popular notions of what the word 'introvert' means. Very few people are introverts across the board. As you note, you yourself are communicative with people who share similar interests. What may not be as plain to you is that shared interests take unexpected forms. You may not think of yourself as interested in sales, but chances are, if you end up developing physics simulation software and try to sell it, you will find you enjoy the process. That's what happened to me. Techie turned sales guy (founder). Never thought selling software would be so much fun or so satisfying, but it is (probably because I wrote much of it). When I am selling software, I find myself as extroverted as any other sales guy I've met.