I can really connect to your story. Disconnecting from my oldest brother was really a no brainer (and actually supported by the rest of my family), but that left a lot of space for me to think that the other brother should be a role model and he's kind of like your sister that left to New-York. He has been a DJ for most of his life, lives in "the big city" Tel-Aviv (which is the Israeli version of New-York, a lot of short sighted 20-35 year old people who pay a lot for night clubs, rent. coffee houses and cry about the price of living and capitalism) and chooses not to have kids because "it's not like the world will be hurt if people will have less kids or something".
If by RPG you mean video games of that category, than I actually played a lot of RPG when I was young. I'd spend most of my time on the computer actually.
I'm happy to see that your answer includes a lot of stuff that I've done over the past year and a half. I became a lot more picky when it comes to friends,also removing a lot of my social circles that had a bad influence on me. I changed my mind over whether or not I want kids. I don't completely avoid alcohol, but I barely drink and I definitely don't have these relationships where it's all about the alcohol and you can't have a meaningful conversation ever.
Yes, I took the advice of meeting more real people to heart. Over the last year I spent too much time in the library of the university and haven't had a lot of socializing except for some awful people I met through Facebook. Now I work in IT so I'm surrounded by more high quality people, so I try to spend more time on meeting them and less on Facebook.
I also take to heart the part about leadership. I want to use my skills to bring these ideas to my country. Israel is a very high IQ country and I can see the potential, but I'm having those mental blocks every time I open the video editor. I'll probably do it someday, but I have more important issues to bring to my therapy sessions and I think it can wait to a better life situation so I can actually do a complete and not half-assed job at it.