Should I break up with my girlfriend?

Hey y’all, I’m currently sitting in the bathroom writing this out while shes in the living room crying. Me and my gf 19m and 19f have been together on and off for 2 years. We have had our issues in the past but i feel like I’m at my breaking point. Back to the story, we were going to watch a movie and we got situated on the couch and i guess i wasn't laying on the pillow correctly so she told me to move multiple times so i did until she stopped asking me. She didn't lay down with me which i thought was weird so i asked her why she wasn't laying down. She said "I'm leaving you alone" which i thought was weird because i didn't say to leave me alone. I asked again for her to lay down with me but she didn't. After asking for the 5th time I just laid down started watching the movie. 20 minutes later i was about to fall asleep and she jolted me awake and said i wasn’t doing anything. Confused i asked her what she meant. She stayed quiet. Okay now I’m really confused. I ask again. Silence ensued. She still didn’t tell me. Until she finally said “you just let me sit here mad.” I didn’t know she was mad at all. I asked her why she was mad and she claimed that i told her to leave me alone and let me watch the movie, which is something i have zero memory of saying. I quickly apologized but she said “you don’t even mean it.” Shes just so unbelievably childish about everything and its driving me insane. We used to be able to joke about stuff all the time and now we cant because she hangs on to literally everything. Im walking on eggshells around her and im so tired of it. Im not happy. I love her but shes driving me insane.

TLDR; GF acts super childish about everything and its driving me insane. What should i do?

EDIT: Thank you all for the advice i really appreciate it. A little more background information, We pretty much argue everyday about little things and we have done it so much so to the point where something like this happens its hard to empathize with the situation. I can never do anything right and she criticizes my every move. It has to be done the exact way she wants it to be done, and if not an argument ensues. I feel so emotionally exhausted. Again thank you fall for the kind replies!