Ryan, everything gets more and more awesome as you get older, as long as you make good choices while you're young. If you decide to get married and have 4 kids by the time you're 19, then your life is probably going to feel a little limited. Not that it's a bad thing to do something like that, but you must realize that you are putting a limiter on your personal issues, wants, wills, and needs when you bring other people into the matter.
I don't want to tell you to be selfish, but do what's right for YOU. Don't hurt anyone in the process, but don't hurt yourself for anyone else. Learn from your mistakes and move on. Don't dwell on regrets. I have absolutely no regrets, and I did a few stupid things when I was in my late teens, early 20s. Accept them as learning experiences and that's that.
Lots of people ask me how I've done all the shit I've done. I just tell them that I just did it. It's no secret. If you want to do something, weigh the consequences and make your decision. If 99% of the people tell you you're a moron for doing something but you enjoy doing it and it's not like smoking crack or something like that, what's the problem?
Everyone has this fear of getting old. People think that when you're 30 you're supposed to be married with kids, working some shit job you sacrificed all your dreams for. I sacrificed my steady and well-paid job for my dreams. You have to decide which is better for you. Stability and very few worries, or a little more stress but in complete control of your own life? The choice is yours. I turn 29 next month and I've done more in the past ten years of my life than most people I know have done and will ever do. You just gotta do it.