[chrisrickard]

My 2 cents: Work hard and play hard.

I run a company, but after work a few nights a week I will code for fun, or go out with friends to eat/drink/chat.

I think if in the future you want to "create a hugely valuable and profitable startup" then being a better programmer will certainly help, but the interpersonal skills will also be huge.

Leading a team, steering direction without conflict, managing conflicting interests - you learn these skills in life, not on a keyboard.

PS - why not start a hobby project that encourages you to socialize - an app that reminds you to connect with your friends & suggests common activities :)