It has occured to me that maybe you come from a family or culture where outdoor shoes are not worn in the house (or at least the bedroom). It may be hard, but that is just not how most people do things here. You can still keep that kind of cleanliness in your bedroom, but you’ll have to adapt and extend the boundary to just inside of your bedroom door. You really can’t expect three other roommates to accept your shoes stored outside of your door unless they are doing the same thing.