hitting some nerves I see?
Apparently you equate fun with dating or messing around with the opposite sex to enjoy life. Well life is more than that: Learning new skills, traveling, partying it up with friends, and being care free about how you spend your free time. If I want to work 16 hours a day for a week and then take off the next week to go chill in Ibiza, I can. If I decide to have a quiet Friday evening with the inner circle of friends I can. I own my place and my parents are like my friends, my passport has more stamps than the average person, so yes life is good.
But like others said, maybe its an issue about finding the right girl, who would not be boring and actually keep up with the lifestyle. Far too many married people are stuck in routines, limitation and general lameness. I mean if you’re getting married in your 20s and not having kids right away, there is absolutely no reason to completely change yourself simply because you have a significant other. Enjoy things, be adventurous, mix it up.