Hey
First of all you have not mentioned in which tooth particularly you are having pain. The intensity and severity you also have not mentioned.So it’s little bit difficult to say.
Next Steps
As per your x ray the x ray is not in correct angulation.still though there may be proximal caries to the first molar.(not sure as the x ray is not proper)
Health Tips
Go for an proper IOPAR Xay and opg. And visit to your nearest dentist.
Or contact here with proper details.
Thank you
Have a nice day.