Scratching your back is a normal human behavior and is not in any way related to selling your soul to the devil or any supernatural concept.
Thoughts and fears like these could be associated with anxiety or intrusive thoughts, which are common in anxiety disorders. It's important to remember that anxiety can cause our minds to generate irrational or exaggerated worries. These thoughts do not reflect reality, and it's essential to recognize them as such.
If you're experiencing excessive anxiety or distress due to these thoughts, it's crucial to reach out to a mental health professional, such as a psychiatrist or psychologist, who can help you better understand and cope with these feelings. They can provide guidance and appropriate treatment to help manage anxiety and intrusive thoughts effectively.
Remember that seeking professional help is a sign of strength, and there are effective treatments available to help you feel better and manage anxiety. Don't hesitate to talk to a healthcare professional about your concerns so they can provide the support and care you need.