I like to squeeze my testicles while in public.
I hope that's a joke. Why would you want to squeeze your testicles?
Because it makes me feel powerful.
It's understandable that you want to feel powerful, but you should not do this in public. it's crude and it's rude to act this way in front of others.
It's good to feel powerful. You should try it some time.
This is not something I will try as it's not good to do something this crude in public. Some might be offended and report it as an indecent act. You should look into more respectful ways to gain confidence in yourself.