I need substitutes for self harm :[

Anyone else accidentally short circuit their pain receptors by trying to imagine solving the problem when you're in pain without actually solving it and then get hooked on the temporary relief? How the hell do I break this habit. Its lovely, but unhealthy

I'm at my college and don't feel like being here. I didn't even want to come here. I woke up with anxiety bc i feel like i need to solve this. I had a bad stomach ache when i arrived to school and still havent even eaten breakfast yet bc i feel like i have to solve this. Im just so worried bc i have harm thoughts daily. If i could i would remove this! I dont want to think anymore. Its just, how do I know i dont have real urges when I'm feeling a negative emotion like anger or disappointment or annoyance? Im worried EVERY time i feel a negative emotion. Yesterday I was playing video games with my neice (we are close in age range) and she made us lose. She started blaming me and I guess i felt a little annoyed, it really wasnt my fault (dumb mini argument it was more playful since we started laughing but it was a bit annoying). Anyway i got a harm thought while feeling annoyed of me getting off the couch and lunging at her to attack. I immediately look at my bodily reaction and I tense up to stay as still as possible. My stomach was hurting and i wanted to leave as fast as possible. I stood up and turned off the game and said i was tired while making sure to stay back from her (and i had my hands away and stiff) but i felt so uneasy. I laid I bed and felt sad and heavy. And i kept getting thoughts that said "íts only a matter of time before you can't take it anymore". I started to reassurance seek using ai to ask if i was about to or if they are real urges or thoughts i mean until i eventually fell asleep in the middle of the compulsion. Im just so worried, what if I act out impulsevly one day? I dont want to! But what if when feeling a negative emotion, i suddenly dont care and do something? I really dont want to! I dont even want to feel negative emotions anymore since they trigger the thoughts and I dont want to think about any of that. As a result i tend to avoid my family as much as possible bc they are annoying sometimes. I just wish i was all alone sometimes so i wont get any more thoughts and so everyone can be safe. I usually just stay in bed under my blankets all day long to avoid my family and pets. I am constantly uncomfortable. I miss when i would never think any of this. Living life has become very scary for me now. 😞

I get these violent urges thats started randomly and now i feel like ill hurt someone it feels impossible to control almost gets me shaking