Why am I like this?

I can't believe I'm upset over this but I was supposed to study for a test with my mom. Nothing big. But she just seems to do everything she can to not have to study with me. Like she'll have to print this important thing or she "called her boyfriend on accident". To me this feels like she doesn't actually value our relationship and I feel so unimportant. I know this is probably silly and I should be upset over it but I am. I am currently crying in my room thinking about what I might have done wrong to make her do something like that. Maybe I'm just paranoid. I'm sorry