How can i change my NATION?

am warrior and choose uldah but just realized all war stuff in limsa and can i join any company? or need to be same nation?

There's no way to change nation or Grand Company. You're stuck with your choice.

You are now in a thread made by a troll.
Who is quite possibly a Rokien alt.

Please note the troll's lvl and inability to join ANY GC.