I am 24 yrs old, being at a young age.
I never had this happen, it started at the middle of this October. I am at a small private college living in the dorms and eat at our one cafeteria; would it the food from the cafeteria?

It could be many things from an ulcer, hemorrhoids, etc. Only a doctor can tell you what this is. It could be something VERY serious or something quite minor. Please make an appointment with your doctor for a prompt diagnosis and treatment.