Going to tryouts alone because your friends backed out is the moment you find out the goal was yours.

Shared enthusiasm hides whose wanting is whose. When four of you are going, nobody has to establish whether they actually want the thing or simply want the afternoon, and that stays comfortably unresolved until the others drop out. Then you find out for free, standing in a doorway, what you would otherwise have taken years to work out.

Go, and pay attention to the feeling at the door. Dread about walking in alone is a different thing from not wanting what is inside, and it is worth telling them apart before you decide anything.