I too had a difficult childhood and overcame some moderate difficulties. Then I proceeded to waste my adult youth (20s and most of my 30s) in a multi decade pit of depression and withdrawal from the world. So let's not forget survivorship bias.
Add me to that list. Became sole breadwinner at 22 for a family that had $2M in debt due to failed business. At one point, I was held hostage at gun point by a debt collector. Deeply scarred by debt to this day. Scared of investing anywhere and just hoarding for a rainy day. No family to speak of except wife and child. Very few friends. No purpose to life other than seeing my child grow up and be successful.
> No purpose to life other than seeing my child grow up and be successful.
FWIW, in my opinion (and in the opinion of evolution and biology), raising children is the purpose to life. By having children, we give another human the ability to experience life. And, for most of us, they are the only lasting mark we will leave on existence.
Aside from the philosophical side of your argument, there is of course the biological argument: There are far too many people. I understand that anyone who advocates reproductive moderation will get out-competed by everyone else, but that doesn't mean that we have to accept mentally that this is the purpose of life. I'd argue that seeing this as your one and only purpose makes you akin to a cancer. Your genes exist to consume, but fulfill no real goals.