What do you do when you find nice guys, but they aren't the one you've been thinking about?

so to make the story kinda short, there was guy A, guy A asked me out but i like him more of a friend and i said that to him... guy B also asked me out but i see him as a friend too... guyC is making me wait so that we can talk in private probably to ask me out.... but guyD is who i really like.... i reaaaaaaally like him, problem is he has a girlfriend in another country.... hahaha..... what do i do?? ddo i give guyC a chance and just forget about the guy i really like?? or what?