Is it normal i get bothered when using the computer around other people??

I HATE people around me when I am on the computer. They don't even need to be looking at my screen or anything, just having them around is annoying enough, especially if they come out of nowhere..

And before anyone asks, no, this is not because I'm seeing embarassing stuff or hiding anything. Idk why, the feeling of being monitored/judged bothers me so much I can't concentrate in whatever task I'm doing, and in turn my irritation goes up. As I write this, in fact, my mother is in my room using her cellphone and I'm really bothered by this, really want her to go somehwere else but she won't get a clue. She's here for an hour already.. I have an essay to do but can't do it because I can't focus at all! IIN??? :(