Next Step

I am preparing for my next step in my transition. I need to buy a STP. I find that I am having a lot of anxiety going to the men's bathroom. I have to use the stall because I don't have a STP. I am afraid someone will come in and hear or see me sitting down to pee. I know they say that most men go into the bathroom do what they need and out of there. But what if I get caught? Why do I feel its about a getting caught thing? I have found myself holding it until I get home and I should not have to do that. With a STP I could still use the stall but also could stand to pee. So the next step if picking and buying a STP. Teaching myself how to use it and throwing that anxiety out the window.