we are animals who are programmed to reproduce.. it's not normal, it's "immature" to want to live like a teenage boy for your whole life. Even if your father who regretted everything in his life giving birth to your sorry self included told you to have as much fun as possible instead of marrying/having a family.
Society conditions us to give our best in our 20s/30s to find the best partner with the best genes so we can produce the offspring with the highest odds of survival in the environment we re living in. Good looking, good earning job, power, respect, money, best suburbs.... In our youth we have the maximum testosterone production, we defy, fight, other males for the best females, then in our 30s as natural test production decreases we re genetically engeenered to calm down and focus on transmiting the strategies of survival we inherited/acquired to our offspring.
We are all prisoners of this little game the minute we re spawned into this world. Old people know we re just animals, they have had the time to think about the whole picture and always come to the same conclusion; life is unfair, crual and absurd intrinsically, it's all about your genetics and upbringing 50/50, and before being religious, philosophers, thinkers , believers, we are... animals. It's our animal brain which generates all of these bullshit meanings we give to life, our existences. In the end it's always about killing or getting killed. Some are better trained, conditionned, engeenered bytheir caregivers to dominate the competition, others solely exist to feed the strongest. Just like in any animal or vegetal species.