My frustration is high, any help is welcome!

Here's my problem. I have groin pain in rest. Near the femoral artery. When I pull my knee against my chest it gives a burning pain in my groin . When I bend over, I get a dull groin pain there. When I sit long, especially on soft chair, the pain travels to my hip, knee and even in my underbelly. I went to PT, no diagnose. Went to sportsdocter who ordered a groin ultrasound, Plain X rays and a bone scan. Nothing. But the pain won't go away! When I excercise the pain is minimal, slight discomfort and it doens't get worse. When I stretch the musscles everything feels fine. Often I can't sleep on my hip and and the other side I put a pillow between my knees, so the pain in my groin gets less. I have taken rest for 1 month, but no result, sitting makes it more worse. I am a 21 year old female whith 8 months pain now!

Please does anyone has an idea what to do?

Many thanks