I also began pretty early, partly due to being overweight. I started menstruating at 9. I'm sure some people have valid fears around puberty especially if they had no education or warning about it. The big issue with adolescence isn't adolescence itself, but the adults in your life and the kids around you. My mom and grandmother didn't get that I couldn't use tampons at 10, I still can't as an adult. The issue wasn't I was scared or hated my period, I hated tampons and the adults being reluctant to give me my pads. Breasts and wearing bras was easy, but kids at school do not make that process easy with their insults and eyes.
OP is right, puberty is just a process everybody goes through, there's nothing inherently bad about it or great. It's normal and healthy, it's just how the people in our life react that make the idea of it traumatic.