You, and many others in this modern world, remind of Dostoyevskian characters: neurotic, overly-emotional, busy buzzing around, the cause of all their own problems. No one can sit still in silence, alone with themselves -- they're always running away. There's always some emotion taking hold of them, and can't simply let it run its course. No, "something must be done!"
It reminds me of the Russian "martial art" система: the more you "hold on," the more pain you will feel, and less effective your moves will be. Somehow, people have never learned to let go, and become completely relaxed. They're constantly holding onto something, and being thrashed around by life.
Perhaps you people need to try ayahuasca? Or maybe meditation? Maybe drink less coffee? Maybe stop forcing yourself to do all of this stuff you really don't want to do? Take a break? Become mindful of your body, mind, and soul?
I have 2,000 weeks left. My life will not be lived "fully" to the standards of some over-socialized urbanite. That is fine. I have things I want to do. I don't care about anyone's opinion on them. Knowing I have lived half of my life already doesn't stir any emotions in me. There is no existential dread.
There is no "start" to living a life. You're living one already. If there are things that stir emotions in you, let them. Never exploring your feelings, leading to the emotional depth of a middle schooler, is one way to not live a "full" life -- not some inanity about "spending" your time "better" (to reduce life to some abstraction is only for the soulless).