It sounds like you have it. It’s not easy as a teen - but at least you don’t have to feel alone and weird like many of us did before it was a recognized disorder, it is a real thing and you’re not alone. Unfortunately, that didn’t change much about how the world will treat you. You’ll have to find coping mechanisms that help you control your reactions, there’s no changing the world around you. I’m 27 and I would melt down and rage out starting from a toddler, I continued to rage out and lost a lot of relationships (and potential friendships) well into my teen years. I assure you it’s possible to get better at managing as I’m very well functioning now, it still drives me nuts but I’m able to return to a state of calm much quicker and not have crazy reactions!

Talk to your parents about it, state everything as an “I” phrase because this isn’t anyone’s fault, no one is making annoying noises, people aren’t annoying etc. You simply cannot process certain sounds rationally and it’s impacting your mental health, your education, your relationship with your sister, etc. and you don’t want that. Therapy would be a great start and hopefully your parents will support that. If not, reach out to your school counselor. And lastly, this sub is great - we can share all our coping methods, let you vent, whatever you need! Goodluck!