It's self injury. You don't have to draw blood to hurt yourself. Some people swallow dangerous things, or poison, it's all self harm, it has the same intent. You beat yourself so hard you nearly passed out, it sounds so painful and scary.
I'm so sorry that you needed to do these things to yourself. Angelique's suggestion of the pillow is a great one, also getting a proper boxing punchbag set up can be helpful, or turning it really positive and taking up a martial art.
Hugs xxxx