@AHungryCaterpillar
YANBU to be upset, as you are still quite young. As people have said though, it's not uncommon to start going grey in yours 30s. I didn't get my first grey hair til my late 40s, but I know many people who started getting grey hairs at 28-35!
Just dye it like many other people do. I absolutely dye mine, and always will. Like fuck will I let the grey show - ever! If others want to, then good luck to them. Even though I don't mind looking my age, I refuse to look older.
And yes, going grey as you're getting older IS ageing. There's a couple both aged 58 in my street, and I have known them 5 or 6 years since they moved in. So since they were 52. He has always had grey-ish/white-ish hair, and SHE was brunette. Looked natural too as she has brown eyes and olive skin. She looked roughly her age; maybe 3-4 years younger. HE (even with the grey/white hair, also looked 3-4 years younger.)
A few months ago, she decided to 'embrace the grey' and stop dying it. She looks like she has aged 15 years. When I first saw her the other week (walking down the road with him,) I thought he was with his mum! I am gobsmacked at how much she has aged with her hair grey now.
As I said, no WAY will I go grey. The blonde is staying!