Seriously - I'm not trolling or trying to be abusive. It seems to me that's literally what you're saying.
Life isn't rational. Pleasure isn't rational. In the grand scheme of things, no achievements are significant or meaningful. But that's no way to live a life, IMHO. I know I'm far happier with my children than at any other time in my life, and I only had them when I was in my mid 30s, so I have plenty of perspective on life with them and without.
Yes it was hard work, but so are most things worth doing in this world. I may not really believe that which does not kill you makes you stronger, but I some of the hardest things I've done in life (armed service, relationships, children) have enriched me the most as a person.
I can't say the same is true for everyone. We all have different hopes and needs, desires and goals. I'm happy with mine, and sincerely hope yours work out as well for you.