It's not that hard for males to not grow up but I agree, OP will change anyway. I used to think something similar around age 12, when I was becoming an adolescent and other things and responsibilities came along: I thought I would always identify and connect better with children than adults. It didn't work out. I can identify and connect with and relate much better to adults. It was a naive thought.
NEVER have children if you don't want to grow up haha. I never felt like an adult until I had to figure out how the hell to fit daycare costs into my budget. I'm kidding, sort of. Kids have a way of keeping your heart childlike. It actually sounds like you're just referring more to a conventional lifestyle rather than "growing up" because as you'll discover in the next couple of years, being grown up is a myth. Some people take themselves too seriously, some make and meet very conventional goals which can give the illusion of being grown up. Just remember how to have fun in life and you'll be okay.
That may have been true in the old days --- these days kids are having kids and some of the adults having kids have selfish, childish ways too.
i was more grown up at 12 then most people act like they are at 40. so i've never seen any reason to change that. and now i'm 66. i wonder if that means i'll live for another 12 or so. what people call growing up is a cultural thing. it doesn't mean judging someone else's maturity, but it does mean recognizing not being the center of the universe, not whining about not being, which is what so called masculinity, or perhaps ego in general, seems to be about. and it does mean having consideration for everyone and every thing, regardless of any conception of ranking or status. but there are other things. things people call growing up. things like abondoning the dreams toys represent. equating conventionality with maturity. putting what other people think of you, ahead of the kind of beautiful world we could all have and enjoy. THAT kind of 'growing up' is the opposite of any kind of sensible meaning to the term. THAT kind of 'growing up' is the very thing we don't need. none of us. not for ourselves and not for each other either.
No, years ago - very young women would get married and raise a whole family while their husbands went to work. Now-adays -- highschool girls are popping out babies left and right and alot of them are dumping them on grandma (their own mom) to raise them while they go out and party... I blame it partially on the Epidural. When I was younger and you got pregnant, you had to sustain hours of painful labor -- some women were able to get Epidurals -- but now the have nearly perfected the Epidural, most every girl gets one and has NO pain during labor...it's just popping out a baby and going on with your life. No lesson is being learned and nothing to fret about getting pregnant. If you suffer 16 hours of hard labor, for example, you won't want to get pregnant again so easily!
My great-aunt was 13 when she gave birth to twins. My grandmother was was 16 when her first was born (42 when her last one was born). But I do see what you are saying. Kids now have kids without any sense of responsibility, but part of that is because of their parents. I'm not sure it's the Epidural. I had one with both of my kids and still had 23 hour labors and was a very responsible parent. Responsibility is like anything else, it needs to be taught and learned.