Plane peeing is horrible! Had you drunk a lot before you boarded? 

My mom pees with the door open as does my brother.  Dad goes out in the backyard because it's closer than the bathroom.  (They live out in the country lol).  Needless to say nobody's too shy about peeing but I've always shut/locked the door myself.  My parents were both raised in the '60s/'70s so, while they're not nudists or anything, they're not exactly modest or uptight about bodily functions.  In some ways I guess.  They're actually pretty conservative when it comes to sex.  

if you want to go for it😁 i also was afraid before i did it the first time, it was in a very big Hotel when i was on vacation, went to a public restroom there in the night after going out, was a little drunk and peed all over it, toilet paper, floor, walls etc... in the end i was not ashamed because i know how much it turns me on and it was totally worth it for me