DRAWESOME

Ooh, gotcha. Yeah, it's mostly a matter of practice, and I'd suggest starting with something sorta in between 'simple box' and 'entire room'. Like a single, simple chair or other small household objects like shoes or toiletry bottles or windows or lamps or whatever. Which I know seems really boring, but it helps, because basically a room is just a box with a bunch of individual stuff in it, so if you feel like you can draw the individual items comfortably in whatever perspective, the whole room seems less bad. Good luck!