Possible crush

Soo, me and my two best friends from primary go on the bus together. Ones a girl(A) and ones a boy (B). B is bi and A is straight. I think A likes B which is fine. Problem is, I think I like B as well. I think about him a lot and once I had a dream about kissing him. So I don't know what to do. I'm absolutely clueless about this cause all I've ever had is one crush on a guy that lasted until I found out he sucked. Help me please! What do I do? Also I don think I'm really supposed to date amyone.