I pushed myself to get right to work after school, to live independently, to raise my child, etc. right on time or perhaps even earlier than many people, including many NTs, but I definitely don't feel I was mature or "ready" - I was just playing a part and suffered tremendously for it. Particularly, I had very high anxiety nearly all the time and even fainting spells due to fear and anxiety as I knew I wasn't actually ready for those things and didn't have the social skills to do them correctly, so I always figured someone would "figure out" what a fake I was somewhere along the line and fire me, not let me rent from them anymore, might question my parenting abilities, etc.
Pushing myself didn't make me actually ready, it just made me functional within societal standards.
I am pushing 50 at this point and only now feel even the slightest sense of inner maturity coming on (as opposed to my maturity "acting"), and even there, it feels like a very delayed maturity for my age.
But I can say, to give a work example, that I have been a very good writer for as long as I can remember (not in my own estimation, but rather in others'; especially teachers), yet I didn't start an actual writing job until 1999. At that time I had already been in the workforce in non-writing jobs for 14 years. It took me all that time to feel "ready" to work a "real career" - writing - v. a job that would simply pay the bills. And as relationship examples, only now, 13 years into my second marriage, do I feel I'm at all a mature partner who can give-and-take, and only 29 years into being a parent (my oldest is 29; my youngest is 9) do I feel I'm becoming a good mother as far as handling things without severe anxiety, being able to see the bigger picture, remaining calm and so on.