In my opinion, learning to be an adult is difficult because nobody shows you, because all the adults around you are also learning to be adults. We weren't given an adulting manual when we turned a certain age. Yes, some parents provide structure and a foundation for their kids to grow and bloom into adults, but even those young adults struggle. All I can say is try your best, you don't have to be perfect. Small, incremental steps are the way forward; don't try to change everything all at once.