Help

So I am in a big fight with my school friends right now and I don’t think we will fix them but they still have my concert tickets bc we wanted to go to 2 concerts together. Now I’m scared that if we really don’t like eachother anymore and stop talking that I won’t be able to get my tickets. What if they don’t give my tickets back, for both of them I probably paid 80 or more euros, wich is A LOT for a 16 year old. I think they will give my money back if I ask but I’m scared that they will give the concert tickets to someone else. What if they don’t give me my money back? I’m scared, is there anything I can do when this happens? Like go to police or smt idk? It’s more that 100 euros in total so I really don’t know I’m stressing out. Even though I don’t really know if we won’t be friends anymore but with what happend so far I don’t think so