For those who get anxious about asking someone to take a picture of them; you don't always have to use words.
If you can muster up the courage to make eye contact with someone, "all" you have to do is smile and hold out your camera. I'm pretty sure most people will understand you want them to take a picture of you. If you want something in particular in the background I guess you could point/make general arm gesture to it and yourself.
I'm an introvert myself and at worst when someone asks me to take their picture, I worry a little that it won't be exactly the way they want it, but then realize that it would still be better than nothing. I always take at least 2 shots and ask for them to check (or point to the camera screen and say "ok?"). Someone asking me to take a picture has never taken me out of the magic or had any effect on my holiday experience, please remember that.
Oh and, I may be generalizing because I use a DSLR, if you're worried about bothering people during their holiday, if you see someone walking around with a DSLR (the big cameras with big lenses), they most likely love photography and would be more than happy to spend a minute helping you out.
As an aside, I loathe selfie sticks and reading about people losing them on rides is, quite frankly, frightening. What if it gets stuck on the tracks and the ride derails? People could die.
Banning monopods on the other hand seems kinda silly if that would be the case. Unlike tripods, they don't really take up extra space or hinder anyone's view. And using a monopod as a selfie stick? I dunno, that seems incredibly impractical. I for one would't be able to hold that entire, heavy, contraption steady enough to take a half way decent picture. On top of that I'd be terrified of someone knocking it out of my hands and dropping €1000+ of equipment on the ground...