i think from 18-21 is a very difficult age. You are in no way an adult but you aren't a high school kid either.It's hell to be 19.
You want to be a grownup but you also dont want the responsibility for your actions like a kid.
An awkward time indeed.
Fortunately, around 23 or 24 your realize your parents did know WTF they were talking about and had your best interest in mind. Takes some maturity to realize that.