MY FIRST LOVE😊😒😞😝

okay so I am 15 years old and I have never had a real relationship before. Me and my boyfriend have been together for 10months and I am head over heels for him. I am an emotional wreck and I am always being mad at him. The only reason I am mad at him is because I want to be with him all the time. He doesn't understand why I get so mad but I do. How do I explain that I just really love him & I've never had someone like him before?😞