"When your life progresses to 100% you will die" - This is the ONLY known variable. Death.

Life (like mose things) is relative to the perspective viewing it.

Who's perspective seems to be the answer to the question "is my life worth living"

Perspective is relitive to your perspective Thats why i say "MY" (see above)

Simplify life to zero by killing ones self. Death is a realise.

If you know that currently you will have no impact on the time line of the univers, then it is possible to evaluate life to zero, which is what causes suicide and propels it, It is also why so many choose not to think which is a crime.

suicide is a loop <so can you get caught in it?>