I never felt "grown", to be honest. But I think I start looking "old" when I see myself in videos. But you sure look grown when I see you. You seem to be doing grown things. It's more a perception thing, probably.
Many people who just want to "do something creative", confuse two things. Production and the actual creative process. They see the finished products on the internet but not the 6 years of practice and 15 versions and 3000 failed attempts that lead up to the polished version.