There's just not enough life in our lifetime.
I've come to the conclusion I'll never live long enough to do everything I want. There isn't enough time. Maybe if I lived to be 200 years old with relatively good health I may accomplish most of my goals. That's probably not realistic. I wish my body didn't need sleep. I could be much more productive. I want to learn languages, learn to play many more instruments, study history, study physics, build a house, build a car, raise a family, do the splits. I can work towards all those goals but I'll never cross the desired finish line for many of them. It's an issue of time. Life's too short.