Throughout my 20s I spent a lot of time just playing and not really working but fortunately for me I continued to get just enough work and have a reason to wake up in the morning. I really empathize with some of my peers who had success in the early years then it dries up and so there's no reason to get up in the morning.
My definition of success is to live your life in a way that causes you to feel a ton of pleasure and very little pain - and because of your lifestyle have the people around you feel a lot more pleasure than they do pain.