My lower back hurts a lot when i finish running i can't keep it like this i feel like one day ima get to the point i would not walk and in xrays im ok.

Doctor exam: For a young person like you, that much back pain is not normal. You should see your doctor to make sure appropriate tests are completed. You should also stop running for 2 weeks to allow your back to heal.

See an orthopod: It may be minor but since you're having continued pain you should see a back specialist. You could have a problem that needs treatment.