It sounds like you're obsessing about body parts. Change the question to an affirmative statement. Change "why do I have such and such?" into "I have such and such". These meta-physical questions will lead you nowhere, but the mind still likes to try and solve things. That's the nature of the beast. When it gets to a meta-physical concept like "why", it goes in circles until you break the cycle.
Something else that might help is, looking at a diagram of a human body, and drawing it out yourself. It will help solidify in your mind that you have these parts too, and they have a purpose / function for keeping you alive. Also, this exercise will help to get you out of your mind, and into the activity you're doing.
Something else that might help is, looking at a diagram of a human body, and drawing it out yourself. It will help solidify in your mind that you have these parts too, and they have a purpose / function for keeping you alive. Also, this exercise will help to get you out of your mind, and into the activity you're doing.
