So Alone by Men at Large was one of my favorite Quiet Storm songs in the 90's. So Alone was their biggest hit.
Men at Large was an American R&B group from Cleveland, Ohio, whose members, David Tolliver and Jason Champion, frequently self-referenced their obesity. They scored several U.S. hits in the mid-1990s and were discovered by the late soul singer Gerald Levert. (Wikipedia)
[Sorry the quality of the video is so poor.]