It's just that the past few years I was quite happy that whilst my "number" went up, my personality, sensibility and ability stayed irrevocably stagnant - in effect, I was still a teen. This year, though... I think I've caught up. When I say I'm 21, I feel 21. I don't mentally think I'm 17 like I have done for three years. I feel older.
Now I'm hoping I can take this newfound maturity to the next level. I don't want to stagnate anymore. I want to be something and someone more. I want to progress. Now that I've felt firsthand what that's like, and that it isn't all bad, perhaps I can continue to do so.