feel like a child all the time

is there a way to stop feeling like this?

i feel like im always behind in life with everyone i know, i react like a child, i feel feelings like a child. its like i never grew up and i never will since im so late at everything. im 23 but i do everything like a teen which is embarrassing, but im always embarrassed at myself so idk what is real or not omg idk what im saying anymore i just feel like shit