I dont know what to do

I want to end my relationship but I'm absolutely terrified to do so. We havent left each other side in the 3 years weve been together. Moved in together literally 3 weeks into our relationship. I'm just honestly so tired of being her mother, you know? I do everything for bc of her anxiety (that's not her fault I know) but she never takes my anxiety into consideration and just kinda makes fun of whatever is making me anxious. She complains when we go christmas shopping bc its "waisting" money even though it's my family. We bought her best friend a new microwave just bc theirs was broken and they didnt have money. I love helping people, whatever, you know but I'm tired of feeling guilty for spending the money I worked my ass off for 9 months to earn. We're visiting my family for christmas and you can just tell she doesnt want to be here. She never wants to be around my family. We went out to dinner with my cousin last night and she literally threw a fit the whole time bc she wanted chik fil a instead?? (Weve had chick fil a like 6 times in 2 weeks. I am DONE) my cousin felt so bad for not getting it for her but shes 27 fucking years old?????? idk. I dont know if I'm over reacting or if our personalities are just too different to live in harmony. I'm tired of crying every day. I'm tired of her talking shit to me every time we fight. It's just not worth it anymore.