I love you!! Please remember that you are perfect the way YOU are. Immature or not? Your perfect. Doesn't matter what anyone says, being you is the greatest comeback. It's a gift!!
P.s.
I honestly believe that being immature just means you'll live your life to the fullest, I'm always giggling and immaturity leads to happiness for some reason. I mean, I don't want to be a little snob who sits down and drinks wine at an amazing party while everyone is dancing, right?? ;) I say, screw immature people. (Insert arrow pointing downwards here)
