This challenging is what is concerning to me. It appears that an apartment residence is preferable to a dormitory residence for me. Is this what Sikh student in USA usually has?
Not necessarily. It all depends on your situation. Some live in dorms, some live in apartments, whatever you are comfortable with.
If you read the other responses in this thread, you will learn something else, about being able to handle new and difficult situations and keep your Sikhi practice and also to positively influence all you come into contact with. Your concerns aside, this should also be a goal in your mind
AoG