Otherwise you would have killed yourself.
There are literally millions of people who have tried repeatedly but the instinct is strong and prevents you from actually doing it. Just go to any psychatric hospital and you will see many people wanting to die, living a miserable life, but who have not quite succeeded in killing themselves, and are just barely maintained alive by the system.
In addition, the fact that life is bearable for one person at one moment doesn't mean it will be so as well for its children in 30 /50 / 60 years.
You can dismiss the argument, but it makes sense and this is why eastern european countries have had such a low fertility for decades now.
It just seems wrong to me to deny something so great to your children because you’re worried about global warming or whatever. Let them decide if life is worth living. Give them agency by giving them life.
Also: fertility rates are dropping in all of the developed world. This phenomenon is not unique to Eastern Europe.