im feeling like i dont belong anywhere

im in college and i have four roommates and were living together currently. and for the past eight months we were really close together like we would literally stick with each other24/7. but just recently two of them got really close with other people who are not our roommates. and so everyday after classes they would just go to the other peoples room and im left in my room all alone. and then around 12am then they would come back. i feel this snese of loneliness. how do i overcome this. i wish someone could talk to ne about this.