Long Distance Relationship😔 Need help

Queen
Me & My Girlfriend Met In 9th grade. We been together almost 4 years. Our relationship has been very hard since I switched schools & Now she moved to a different state, Texas , in July. I am moving there soon. But everything was ok in the begining now everything is getting hard. We argue more. Its always my fault 😔 She Say I complain to much but everything i do is cuz i love her. She never care when im maf though its always me overreacting. But when she mad its the end of the world... Can someone please give me some advice . I wanna get us back to our happy place I dont want to lose her. I move in december but its so far from now. Please help me yall😔