Hi. I'm 13 and have the same problem as you. I think you deal with it in a great way. But peeing outdoors is not smart, what if someone see you? Here's what i do: I go to the bathroom every 2 hour even if I dont feel the urge to pee, then I put on the water in the sink, and the sound make me pee anyway. You could try that before your library class or before you go shopping or to the movies. It really works. good luck!