Focus problems?

Don't know if anyone else experienced anything like this, but I just cannot do anything if someone is in the same room as me. Well, I can, but through a lot of anxiety. Even if it's my dad reading something on the background or my besties sitting on her phone. And it wouldn't be a problem, if I didn't literally share my room with someone. My best friend is my roommate and she doesn't like privacy at all. She is more happy to spend time with me than sit and do her things alone. She studies online and we are quite literally the friends circle for each other, so we are very close. But this means, that she is almost always at home, in the same room as me. It's not like we even talk non-stop, she gets busy too, but the presence of someone else in the room (even if it's my bestie) overwhelms me. I feel this irrational fear that whoever is in the room with me is watching my every step and judges me. I know it's not true, I really do, but I can't make myself focus or do stuff for prolonges periods of time just because of this issue. Anyone got any tips on how I can break free from this? I can't really just ask my friend to leave because it's her home too and we live in shared house where every other room is taken by someone else and we got no living room, and because it will simply be rude. It's not her fault I am like this and I can't blame her for wanting to stay in her own room that just happens to be my room too.