My friends ditch me and if i leave they get mad?

So, my teacher decided to go back to 7th grade and let us swap desks and choose where we wanted to sit, both my best friends ditched me and sat next to each other. Now im next to a girl i really dont like. But if i go and choose someone else for something, they get angry at me! so its only okay for them?!? I wanna hang around with different people but then my friends will get mad? it makes me sad and i dont know what to do. please help?