Sometimes teaching hospitals and the teams in them get so busy, teaching doesn't really happen. Often times I've seen students be sent off to go fetch food, fax documents, or just be ignored. There's also just not a lot students can do on surgeries. 90% of the time, students retract, and the other time they suture or cut sutures. But don't feel bad, it's just the high risk nature. The more you prove yourself, the more you're trusted though.
Med school is a time to "put yourself out there" and impress your team by doing as much as you can for your team, though. Volunteer to pick up a new patient or go see the new consult. Teams remember that behaviour and the residents and attendings actually talk about students pretty often.
Never run out of energy, keep working hard and never stop learning.