Why are we preparing for retirement when we don't even know if we'll get to that age?

I'm 29, and I feel like every decision that I'm doing now if for me to secure myself in the future, but damn, It's mentally draining me. I am soooo tired of thinking about ways on how to save myself from a sinking boat, telling myself that everything will soon be better, I just need to face the consequences of whatever decisions I have come to choose.

(paying monthly amortizations for 2 properties, one is a rental condo and the other if a house & lot but not yet turned over, then I'm planning to have our old house renovated to become an apartment/bed space rentals)

So, I don't know if all of these will be well worth it or I'm just driving myself to death in dealing with all the stressors of how to make these all work.