My self harm has gotten worse

I(16m) have been biting myself as a coping mechanism since i was a kid, but ive become dependent on it, it's generally on my left arm, but sometimes my legs, shoulders, wherever i can reach. I do it for any negative emotion you can think of, anxiety, sadness, anger, anything. But i also do it when disappointed or overwhelmed, i guess to take it out on myself. I had left impressions on my skin since i started doing it. But about two months ago due to various circumstances i got much worse, i rip up skin, i bite and bite, last week i had an extremely negative interaction with a friend and to make myself feel better i covered my left arm from the elbow to my fingers in bites, i ripped up so much skin, at least a dozen of those bites drew blood, and i felt immediate relief the minute my teeth sink in, but since then i started wondering if other methods of slef harm would work better to comfort myself. Yesterday i had an argument with the same friend from earlier, it was extreme with screaming and cursing and the like. I bit myself like before, bloody ripped up skin all over my right arm, and it comforted me and made me feels o much better. But i still was upset and hurting, i burnt myself on my thigh. I lit carboard matches and put them out on my skin. It made what was left of the ache and negative feeling fade, as soon as i felt the hot pain. Ive thought about cutting and burning before but now that ive started im anxious i wont be able to stop, and i so badly want to bute or go get another match to help this anxiety fade. Can anyone recommend any thing they've found as an alternative comforting cooing mechanism to self harm