why am i annoyed at my mom for opening my bedroom door to talk to me?

i shouldn't be annoyed. i really shouldn't. there's no logical reason to be annoyed. and yet i am.

several times per day, when i'm in my bedroom doing online college classes (or doomscrolling or playing a mobile game) my mom opens my door to ask me something, announce something, talk to me, or check on me. yesterday she had to have opened it at least 15 times, and i was extremely annoyed for absolutely no reason. the thing is, i want her to open my door if she wants to talk to me, because sometimes i have my fans on and i can't hear her. i have no idea why it peeves me off when she opens my door. is this due to autism? i need to know :(