My group at hostel even my roommate has started purposefully leaving me out !?

ever since i got a campus placement from college girls of my group at hostel and even my roommate has started leaving me out on purpose(none of them is placed yet). in fact my roommate has even stopped talking to me and never leaves any opportunity to hurt me, her ways are damn low standard and cheap! they'll leave me out during meal times! but won't hesitate to ask for anything they want! even they wore disgusting expressions in my presence. its clear that they are jealous of me,but the way they behave with me makes me feel bad ! in cl i'm admired by all people and i'm much of a person who is straightforward and freegoing.i dont like to do backbitting and bitching about others, and i like to play fair! not to mention that im goodlooking as well but inspite of all these differences, things change between me and my friends only after i bagged the job! suggest me how i can console myself because its clear that they aren't my friends any more! what i ask to all is advice me over the present situation and tell me how to choose friends in future!