You might feel that you are one of the very few people who suffer from paruresis or shy bladder, but, just to make you feel better, let it be known that there are millions of people in the US alone who face the same problem. It's not so much of a problem if you think carefully about it. It's something similar to stage fright; your body, sometimes due to no apparent reason, feels that you are in danger and activates its fight-or-flight mode.