Hang in there, Ach. It takes time. I'm 46 and in some ways still an adolescent. Maybe that "Peter Pan" quality is typical of alcoholics. Now, three + years sober I am endlessly amused on a daily basis just by doing "grown up" things. For instance, today I bought a new mop! It struck me as an extremely grown up thing to buy. When I pay a bill on time or file something by the due date I always give myself a little pat on the back.
Normal people are used to doing normal things I suppose. But doing "normal stuff" was always abnormally difficult for me back when I was drinking. My house was always a mess, the lawn was never mowed, etc. It feels kind of Zen-like now to do the dishes while I still have one pair of clean underwear.