I got bucked off my horse (flew from bout 7+ feet in the air) and landed on the corner of my phone with my hip/pelvic bone area. had an x-ray taken but they saw no breaks/fractures. im in really bad pain when i walk/bend/sit etc. what could be wrong?

Muscular/ tendon damage along with a hematoma appears likely and aside from possible damage at a different site, such as spine. Such changes are not picked by a simple X-ray. Muscular tears are notorious for lasting for weeks to months, in case pain persists a higher sensitivity test, such as an MRI may help in identifying the source for the pain.