I hate that I get irritated so easily. Why does this happen??

I’m not sure why, but whenever my family talks to me I get annoyed. It’s like they don’t even say anything to annoy me sometimes but I get annoyed and my voice shows that. I don’t like it so the next answer I have will be calmer and nicer, and then it’ll be annoyed again within the next answer or two. I struggle with this daily and idk why. I get annoyed at the tiniest things said but it’s not like I want to, so I’m constantly fighting to keep my voice calm and try to keep myself from getting annoyed. And I won’t even be in a bad mood when they talk to me or when they’re finished either, so it’s not that either. Ugh. I hate feeling like I’m being mean.