The Mobius strip of my life

I feel like I'm missing something. What I have been doing is all about my future, like if I achieve that, I will get a better job,better payments and a better life. But, will the time that I actually feel like "I'm done" come? Are you sure?

I'm afraid that what if all I'll have are just a wrinkled face, a decrepit body and what I would never get back again?
However, I'm also afraid that what if I'll so regret that I don't do my best at this moment?

Again, there's no solution and I feel like I'm running on the Mobius strip of my life. There's nothing I can do right now but sometimes I feel like maybe, there's a way I can more enjoy my life even though I'm pretty satisfied with my life, now.