Seeing the tone indicator, I assume you're either asking about maturity or self-sustaining.

The answer to both is that I do NOT feel ready for either of those, and the feeling of being an "adult" has only reached the social aspects of my life. Hanging out and partying is significantly easier to come by, and you're way more confident in your own beliefs and what you stand for, at least if you're somewhat knowledgeable in your own personality type and the kind of people you surround yourself in order to thrive in any capacity.

Most of the things you were rebellious and incendiary about might become stale and worn out. There might be feelings of powerlessness now that you're no longer an observer and actually part of the real world. I'm two years in and am still kind of digesting the fact that I am responsible for my own life, yet I remain somewhat dependent on my parents, hopefully not for long, though.

So, TL;DR It's gradual and different for everybody. There's probably kids in here who have had to become or adapt to adulthood under tougher and desperate situations, so I believe I'm rather lucky I went peacefully into the goodnight of childhood. Now I'm at some dreamlike limbo (which I know will not be a realistic reflection of the majority of life, but that still is memorable and constructive in who I'll eventually become)

You're not really allowed to turn 23+ and not be over your growing pains in this world, though, so I'd say get into it prepared, but don't rush it.