Sharing kitchen with roommate

How do you get along! There's this roommate that is in the kitchen at all hours I don't know what the fuck to do she is there when I want to cook breakfast there when I want to cook lunch and I leave when she is making her breakfast when she's making her lunch I leave I give her space but I'm so tired it's like I'm angry frustrated and also want to cry it's some day's I go without breakfast and lunch.

Some day's I spend ten minutes making a quick cereal and some day's I'm hurrying making the breakfast or lunch within thirty minutes and if I take an hour I'm like freaking out and we don't get along we stopped talking to each other and she's a narcissist and give me these glares and hateful looks like she's entitled to the kitchen genuine scares me so I leave. I don't know how to co live with this woman I'm so stressed you guys I'm in my twenties and since she arrived I have grey hairs and I think they are from the amount of stress and chaos she causes drama friends family have asked if I'm okay because my face looks tired and it's from all of this I'm like fuck it I won't use the dam kitchen I just don't understand how she recently gets here and thinks she owns the kitchen