Review Detail of Archclasher in Please call me William III

I dropped the novel, the premise is good to be honest, but as an adult who got reincarnated to a different world, it just doesn't add up how the mc just wastes his whole childhood as a childish person, especially if his past childhood isn't good, he'll naturally have the tendency to become mature enough to make his current life the best he could instead of lollygagging around acting like a spoiled brat.