I have a foot/ankle sprain that hasn't healed after 3 months no fracture i'm worried what's wrong?

See your ortho: 3 months is sufficient time to recover from a routine ankle sprain at your age. If still having pain or other symptoms you should see an orthopaedic surgeon with experience in sports injuries or foot and ankle injuries.

Sprain: Maybe more that a sprain. May need MRI and intervention to manage problems identified.

Have it evaluated.: Swelling may last a long time following a foot or ankle injury. An x-ray can show if there is an underlying fracture. The x-rays may be falsely negative initially in cases of small stress fractures. You may have a soft tissue injury if it is just a sprain and may have damaged the muscle, tendon, or ligaments in the area. Have it evaluated by a professional and get the appropriate treatment.