Why do I feel like my heart was ripped out?

I`m a freshman in high school. My schedule just got changed, and all I could think about was never seeing Ryan and my other friend in my math cl again. I have a crush on Ryan and we only had math together and never exchanged numbers. I felt like I wanted to cry when I thought of never seeing him again. I know melodramatic, but i`m going to his him poking me in the side and drumming on my legs during cl. What should I do? I have to switch cles tommorow.