One single white hair on eyebrow?

I'm 18 years old by the way. I would feel one single hair stick out when i touched my eyebrows. I thought it was because i had to wax my eyebrows. I did but then i noticed a white hair was just sticking out. I pulled it out with a tweezer. It grew back in the same spot. It's on my right eyebrow in the very top. Im a very stressed out person but it's weird that im getting a single white hair on my eyebrow. Any ideas why?
One single white hair on eyebrow?
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