Why does my mom not like me very much?

I got accepted at a better job today, told her over the phone and she was happy for me. When i came home; i usually get to her room to greet her and have a little chat, and give her more details about the job, she ignored me, and stared at what i was wearing a bit, then she started to rant about her day, every time i try to bring up my day she either stare at her phone or flat out talk about herself. She isn't happy for me, not excited, nothing. Also i discovered i have covid, but the only is coughing so i didn't know earlier, she was like meh when i told her, didn't see that look when a mother discovers something wrong with her kid. I'm good to her i swear, i give presents and compliments, i help and care for her, i also cook for her, do anything she asks, but she always seems to hate my guts for no reason. I hate it, it's draining me and i could feel myself getting insane. I wish i could just not give a shit but i can't.

Why does my mom not like me very much?
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