is normal for me to have so many grey hairs?

It can happen at any age and you are just unlucky to have grey hair at a young age, long time ago my hair started going grey in my late 20's and if I didn't dye it mid brown every 4 weeks or so it would be completely white and has been white since I was around 40 years old, now 56, my dad had black hair till the day he died at 76 years old and my mum, although she dyes her hair blonde still has dark roots so we cant say it is genetic, it just happens, Good Luck

Stress also brings out greys.