Is there any history of trauma?
Do you mean you have pain in ankle joint?
Since when you have this pain?
Is there any swelling?
How pain started?
Have you done any investigation except X-ray?
What kind of doctor have you been to ?
What was his view?
Was he able to feel any lump at pain site?
Thanks for all the information.
Since x-ray is normal there is possibility that there is injury or damage to soft tissue i.e ligaments, tendon or muscles in that area, other possibility can be of a ganglion , this pain can be due to early degenerative changes of joint.
You need to get an MRI done as x-ray is normal to find out exact cause.
Get your self examined by an orthopedics surgeon.
If pain is there avoid prolong walks and exercise for while.