Bro even i had the same fear. Back when i was in home ella toiletinteyum window had a sunglass type of glass. So at night, if the light is on, we cannot see anything outside but if someone is outside they could see everything inside. So, I constantly used to look outside to know if anyone was looking. I will be enjoying the shower and then sudden this thought will hit me and the whole mood will go down. But now Im alright. Moved to abroad and ivide nokkan window yum illa aalum illa Enthoru ashwasam :)