There are two possibilities.
1. If pain is more on front part and you can not sit or squat then it is most probably hip arthritis
2, If pain is more on the back of thigh and it is shooting in nature then it it most probably Sciatica
or disc prolapse
I want to suggest you to show it to orthopaedic surgeon
and get it investigated. He may ask you to get MRI and x ray to confirm the diagnosis.