Its not insane - as you mentioned, there are various way in which people self harm. Its also not uncommon for a person to use several methods as means of injuring themselves. I used to cause myself horrific bruises by smashing into things and taking out all my agression on myself. The important thing i guess is whether or not you wish to stop - are you in therapy? Do you think its possible for you to find other means of coping with how you feel? As you're probably aware self harm is a vicious cycle - in the end we can end up doing more and more just to feel alright. This for me was a good enough reason to seek help for it as soon as i could. Im aware you weren't asking for advice and i don't mean to preach, im just detailing how my situation progressed. I hope your situation improves. All the best.