I think this is normal for most people..... there's only a few family members I wouldn't mind if they heard me do my thing on the bog.
Otherwise I do feel uncomfortable.....
Espescially at uni, we have cubicles right next to eachother and you can hear everything! (i.e. trousers unzipping! seriously they may as well be in the same room)
Anyway, I've noticed when I'm in there and someone comes next door they don't do anything until there is nobody next door, or they pee very slowly......
Of course there are those that just let it go completely but thats just them!
E.g I have these friends who are like "lets go toilet together" and one goes on either side and I swear they must hear everything?! But I spose its just one of those things that if you purposely chose to not allow it to be an issue it will become less and less of one.
I suggest just letting it go (try it out) it's good because once you start theres no turning back... even if it's embarassing just do it!
This happened to me once when I was mid-wee and my cousin walked into the kitchen (where all is audible esp. at that time there was no window at the top of the door!) so he could hear everything and I couldnt do nothing about it because the wee was coming out lol so I just sat there with my hands to my head waiting for it to end... just my luck that I had drunk quite a lot of water that day so it lasted quite long!
Gosh that was embarassing...... but anyway moral of the story is, if it were to happen again I would still be embarrased but less so. He's already heard me wee so it wont be as shocking for him...
I know theres advice in this post somewhere 8O hopefully you can find it! I suggest you try and get over it with your family members that you live with first and foremost just so as to make life easier for yourself
You wont really have to worry about other people outside the house but you could always try to conquer that step once you feel ready... or actually even if you don't feel ready, give it a try, what's the worst that can happen?
I always find these things easier with people I don't know because I know I will never see them again so it doesn't matter what they think does it?
Anyway this is way long...... hope it helps a bit