Is it possible to be addicted to a sport ?

Is it bad. For 15 months, I practiced for my high school's cheerleading team. They are national champions so they're really good. I worked hard and was good. I learned the dance, I picked up stunts very quickly despite being brand new to them (never was an actual cheerleader, elementary school didn't have it.) And i had tumbling skills that a lot of other girls who had cheered the entire life did not. So I got really nervous during tryouts and bombed them. Of course I was heartbroken when I didn't make the team. I always loved practicing for it. But now its something more. Its doing the dance i learned at tryouts everyday multiple times a day. It's practicing tumbling for at least an hour everyday. I start to feel anxiety or unhappy when I don't do it. I do it at the gym, on my lawn, at parties, you name it. I have bug bites all over my legs from practicing late it night. I'll tell my mom I will do just ONE back handspring and come inside. Ten minutes later, I'm still there. I didn't get a shower for 50 minutes because I was Practing the dance and flying positions and couldn't stop. I stay up til 3 a. M daydreaming about being on the team. I didn't really notice all this until my bestfriend say she couldn't hang out with me because of cheer Practice with the squad and she felt really bad and I realized I didn't care because I wanted to practice instead. Am I addicted? Is that even possible? Is it a good thing or bad?