People usualy shy of getting their clothes off from their body if left to few of the models and the unwanted girls. Have you pull of your clothes and get naked?
I asked about the time when you are alone in the home, have you did this?
If you are so shy then get some idea from the the link of the post below
Look Good Naked: The Ultimate Workout
The link above will take you to learn a few of the exercises and rev-ail your shyness. It will boost your confidence in public places like swimming pools. Go check out and learn remove shyness and make your self more confident.