You may be an old soul and looking for more and right now the stable life with house and/or career may not be for you.
Stretch and see if you still feel this way in a few years. Many extremely successful people often find that getting married later, having traveled and studied and embarked on self discovery first, is a great idea.
There could still be a lot of happiness in getting your house, car, and family and live an unremarkable, anonymous life. A lot of people will argue that this is one's best chance at happiness because it's predictable and safe. Predictability and safety become much more important after age 30.
But you could be one of the very few who take a different path and invent something huge or come up with a new philosophy or stand out in an amazing way.
When I was 19 I was convinced that I would be different and make a huge mark in music (or something like writing or art) and never ever settle like the rest and get married and live a quiet life. I wanted to be a rebel and live the rock and roll lifestyle and tour and record music many would hear. I didn't want to do college and end up fifty with a string of safe jobs, safe clothes, married, get into a routine, and have an almost invisible footprint.
Well other than a brief college radio hit with no followup and a few really fun years playing and writing music I got to perform, I eventually got a degree, got married, and settled into a quiet, anonymous life. I still do music but only at small clubs and I drive a Volvo and dress like an off duty cop or republican. I go to sleep early and entertainment is just a few popular TV shows. I am everything today what I didn't want to be when I was 19. My thoughts and political beliefs are the same but instead of being radical I only think it.
But what really matters, since you can't keep your youth, looks, strength, energy, drive, health, possessions, or money, is that you find happiness.
In all the striving to better yourself, get good credit, build a career, build a reputation, take care of your house, maintain your health, etc, it's all useless and futile if you don't find happiness. Additionally if you don't love and help your fellow man, then things can be pretty empty, too.
When you are middle aged (or older) or retired, having happiness and having sought it all your life is all you will care about.