Blood Minus

Blood is a body fluid in humans and other animals that delivers necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away from those same cells. That what I read from Wikipedia. And blood has four main components: plasma, red blood cells, white blood cells, and platelets. I am a human, so of course, normally, I should have these four components too. But the last words of my grandma, and all the weird instruction she keeps remind me as far I can remember, making me doubt myself. If I am not human, then what am I? If the outside world knew how different my blood is, will I always need to hide and never feel safe?