Hello Sweetie,...No,... your Not crazy,....maybe in the 'seal sense of alittle bit crazy'.....like all of us,....but NO,...like you said it stems form pain,...and its classic transfarance of pain from you head to your where ever you have hurt yourself,....!!!
Im also an ex selfharmer,....and we talk about it hear sometimes,....!!!
its a painful one for the many that it affect,...!!! My love is with you,...n Dont listen to them,....!!!
Here is a link for you...!
www.kidshealth.org/
Many hug to you .......