I felt as you describe when I was your age. Immature/mature is not a function of age or something that suddenly happens. I don't think I think of myself as having matured until well into my 50s! I think it is a squishy concept like "shame". "You should be ashamed" and "I am so ashamed" are two different concepts? To me, you are "only" 22 so you are less mature than my 63-1/2 years? That's a science given? The amount of life experience I have is greater because I have lived longer but that's nothing to be proud/condescending about, proud or ashamed of?