If you're anything like me, this is a double-edged sword. On one hand, you're proud of your newfound status as "person some lady thinks is an adult," much like you cherish the first time you can buy beer without getting carded. Then again, once the whole "that guy's a man now" dam breaks, it'll flood all over and there's no coming back. Those new adult terms soon start hovering around you in an ever-tightening orbit until they slam on your face like a bola made of social expectations. Through no fault of your own, the "sirs" or "madams" you're getting in customer service situations soon start to seem a lot less ironic. The world has now decided that you're adult enough, dammit. And soon only condescending fuckers refer to you as a boy or girl, which is actually handy because it gives you an extra way to recognize and preemptively spin-kick those tools at the earliest opportunity.
What, did you think "kicking against the pricks" was just a figure of speech?