I usually don't give unsolicited advice.... (yeah, right, Mike...)
But...
As someone who's currently doing the career / marriage / family / house in the 'burbs thing and once did the McJob / this month's hookup / party / living with 'rents thing....
I'm going to offer these words: Definitely have some fun, but give yourself a strict deadline and make a plan for your life. You can have fun, but make sure it's in service to a greater goal.
All the partying and clubbing and seeing live music three nights a week served me well when I became a writer covering entertainment. All the experimenting with new beers and vowing to taste one new thing each time I went out came in handy when I was writing about beer.
The thing I did right was to have an idea about what I wanted to do, and the sense to understand how to get there. That's not a lot of heavy lifting. It's not even as clear-cut as having a destination in life, which is what people often think they MUST HAVE by age 21 or 25. Just having a direction is fine, as long as you're putting in the groundwork to get there. (And by groundwork, I mean gaining knowledge, whether it's college or training programs or apprenticeships or the military)
The only real regrets I have are about money. I pissed away a lot of money the first few years I was making any. I'd spend $40-50 bucks on records...yes, god-dammit!, actual vinyl LPs that played on actual turntables. I'd spend that much in a weekend at the bars...and beers were only a buck or maybe two for a Heineken.
Gas was only a nickel a gallon, and we had to beep the horn gently so we didn't scare the horses...
Ok...jk about that last part...
But seriously....
I really wish I had saved more when I was younger. People always say to do that, and of course, some people do...but may people don't. They buy new skirts, or new watches, or tickets to Cancun, or new mountain bikes, or new cars when their current one is just fine. Putting money aside is both very easy to do, and very tough. It takes a lot of self-discipline when the eventual payoff is so far down the road.
If you save only a grand a year, every year, in an account with moderate interest, you''ll probably have more than $50,000 after 25 years.
So...and here's the big finish...if you haven't already started thinking about what you want to do, it's time. That doesn't mean you need to be getting to bed by 10 p.m. every night and up at 5 to read the Wall Street Journal. You just need to sit down and ask yourself what you'd like to be doing in a year...in two years...in 5 years...in 10 years.
Once you figure out where you want to be, then you can figure out how to get there. Taking a road trip is an apt metaphor for life...