I dunno. I've done a lot of studying over the years about how kids grow up, (wanted to be a teacher, so took the college courses, and then was writing a novel for grammar school kids, so had to see if they had changed in the last 40 years. lol) The information about how puberty happens has remained the same. Girls really are two years older in maturity than boys. I just don't know if that means boys are immature for their age or girls above mature for their age.
Good news though. You are the normal mature for your age. (Somehow this sounds like you could mistake this for an insult. I can't figure out how to fix that, so just going to say, "you're doing good. I worry about teens who are too mature for their age, or too immature. I'm not worried about you, because you seem about where you should be in your maturity.")