Would I do anything different?
Yes, I would go out of my way to game as often as possible, with as broad a group of players as possible.
The few regrets I have around gaming all involve not playing enough. It's as simple as that. Because now, although I have an awesome, regular group in The Tuesday Knights, we only get to play for a few hours each month (the other members of the group have these pesky things called 'real lives' that involve jobs, children etc).
When you're young you always think there'll be more time for gaming. There won't!
Rack up those epic all-night games and weekenders while you (and your peers) have the time and stamina, play multiple times in a week. If a friend wants to try a different system, play it. See how it goes. The main thing is: get your game on!
I still can't believe that when I went to university - as a mature student - it didn't enter my head to seek out the university's RPG club (in my defence, I had been out of the hobby for many years at that stage).
I also kind of wish, when I was younger and fitter, that I'd have at least tried Live Action Role Playing.
From reading Leaving Mundania and the several documentaries I've watched about LARPing, I get the impression that it has a lot of interesting ideas to offer tabletop gaming (as well as cool props and the opportunity to bash people with rubber swords).