Is there a fear that many people have but you do not fear at all?

For example i love the dentist. I don't mind getting injected in my mouth when it needs numbing i actually ask the dentist to have the mirror at the angle that i can watch them do it. Also i really wanted to watch my teeth getting pulled out. However i hate the doctor. I get anxious when i need to get injected on my arm and still scared to get my blood drawn for a test.