These are all good suggestions, but if you ever find that none of your friends from the dorm/class aren’t eating at the same time as you, don’t be afraid to eat by yourself. I do it all the time, and it can be nice to get a chance to just relax by yourself (maybe listen to music or look over class notes) without having to worry about coordinating with other people. Some might think it’s weird to eat alone, but whatever, it’s just a meal.