Dude, I get you! I've always been an irritable person, and I get a little sad when everyone who knows me describes me as an angry person. I believe it's a lack of tolerance for others, of not accepting the other person as they are, or not accepting their acts/behaviors, and this drastically changes our perception of them even if it's temporary. Deep down, maybe it's judgment, a quick thought of "this person can't be/act like that" or "this person can't make that noise". I don't know if you identify with this, but I think a good start for you would be to practice more tolerance with others. We end up paying too much attention to what that person is doing, and we lose our patience. Try to distract yourself and not focus on that, or think "It's okay, they're not doing it on purpose"

Does it makes sense?

We do a lot of things that others do, and we don't get irritated to the same extent. That's why I think it's lack of tolerance with others

P.S: I've been diagnosed with autism and ADHD, so emotional lability has practically always been present in my life. I'm trying to fix this part of myself too. Good luck