When i was born my small intestine was knotted up and some was removed. was that volvulus?

Possibly: The correct term is malrotation. This causes a twist in the intestine which cuts off the blood supply. This necessitates removal of a portion of dead intestine. Another term used is volvulus.

Quite possibly: You say your small intestine was knotted up. That could indeed be midgut volvulus in which your small bowel was twisted around a narrow mesentery, or connection of the bowel to the back of the abdominal cavity. That is almost always seen in intestinal malrotation, when the bowel did not situate in the right location in the abdomen as it was being formed in the fetus.

Possibly: This may have been a volvulus. Have you asked your parents what the diagnosis was? It is helpful to have an accurate knowledge of our past medical history.