For some context, I am in high school and at my school we have music rooms where students can practice their instruments during lunch. Both me and my friend, L, sing. At lunchtime, I went to go to practice and L and my other friends R and G came with me. After I had practiced a bit, L asked if she could practice. Normally I would say yes, but I had gotten sick of her using my practice time and when she went to the music rooms she would spend all the time on her laptop not practicing, so I told her no. My friends R and G said that it wasn't fair if I didn't let her practice, and they thought I was an asshole because I didnt let her practice, so AITA?