My rib hurts a lot and I don't know if its broken from dismount fall?

Might be. You should probably see a doctor. It might be. Rib fractures can be serious.
Only X-Ray can tell. Rib injuries (whether broken or not) are notoriously bothersome, because the chest wall moves with every breath, so it is not possible to rest the injured area. Only an x-ray can tell whether a rib is broken or not; your doctor may be able to order one for you at a local hospital or freestanding radiology office, or else you can go to an urgent care clinic.