Late Bloomer

I was a really late bloomer.  Most girls start puberty at 12 and reach both physical and mental maturity by the age of 16.  I didn't start puberty until the age of 16 and I finally reached maturity by the time I was 20.  I am therefore lagging behind physically (not sure about mentally...  maybe?), and realized that the many comments I get about how I don't look my age directly result from this.  I look half a decade younger.  But that makes sense.  I guess it can be good.  I also realize my parents didn't understand this about me which resulted in a lot of trouble for me when I was in high school.