i’m in my mid 20s but frequently meet 30 (and sometimes 40) year olds that are much less mature than myself, and i also meet 20 year olds that clearly have their life together more than i do. just try your best and try to act like the adult you want to be and examine what things in your life are keeping you from being them
noticing life and slowing things down has helped with every stress my body has, it's also got me going on walks to places i've never been before. I go alone and do walkie talkies sometimes too, which is like an audio journal log. i also get some cool pictures out of it.