I won't even begin on the errors in your speech, just your arguments.>is to enjoy yourself as much as possible
What if it's not? who the hell are you to say life is supposed to be fun? not saying it can't be your point, but many peoples happiness directly causes some others to loose theirs. No one can ever fully achieve this unless through God or another higher power, your brain can't even physically do this as you just get used to that level of dopamine and its not as happy anymore. what even is happiness? you are literally talking about philosophy when we are talking about cold hard truths of nature and science.
Second, you've said that I would just kill myself when my children are strong enough to survive on their own.
This is a ridiculous statement and you knew it as you typed this. I would survive to aid them in their lives and their children until I could not, using my knowledge to make easier their lives so to ease their ability to continue the mission of reproduction, obviously it's not all I care about but it is a force that drives every aspect of our lives. even yours.