At what point did you realize that you were growing up?

Just got out of high school and I know everyone will grow up at a different age in their life I just never thought I would so soon. As an ex I bought myself a sports car in high school, camaro, and I use to love to race rev and drive fast and stuff like that. But now in college it isn't the same I haven't raced since then and I am pretty sure I am getting out of the phase and I want to focus on school and my future. I want to get an apartment and move out. *Note I've had a job since senior year in high school and pay for the car and phone myself* I guess my question is when did you grow up? When did you realize that there was more important things in life than drama fights looking cool and all that other stuff. I will never completely grow up but I know I am no longer a kid.