What is growing up?

So guys I'm writing a new poem, and I want to know what growing up means to you, try to keep it like 1-3 sentences, but like PLEASE no one word answers. Thank you!!

A sense of finality as I realise that things will never ever be this easy and cozy again. Also a broadening of perspective, realising that what seemed earth-shaking before is much more manageable now.

the realization that i am not naturally good
the splitting apart from what i am unable to be
the reforming of my own self with my own hands

New perspectives but yet realizing I'm not so different from when I was a child.

Growing up to me is yearning to be young again.
I am young but I still wish I was the old me and not what I am now.
(Hope this helps T-T)