are there people who change their hair colour magicaly every year?

Answer 1

unless their career is magic, no, no one does that "magically". Usually they plan for it, go to the store and buy the product or get it done at the hairdressers.

Answer 2

I don't remember my natural hair color anymore. Im was constantly changing it, and I finally stopped because the damage to my hair got so bad I ended up getting hair extentions $$$$$$$$, so I could give my real hair a break and let it grow out. It got so damaged that it would break off, my hair would never grow long because of it. If you want to color it don't do it yourself, go to a hairdresser. I wish I did.