If you love it, that's all that matters. I hope you don't listen to the ignorant ramblings of those still living within the bowels of bigotry and racism.
Those of darker skin were some of the first to wear tattoo's. Native American's, Egyptian's, etc.
Very nice and clever idea! To the person who asked why would you want your birthday tattooed on you, I ask, does it matter? Tattooing is all about free expressionism.