Broke Tail Bone And Pain In Underside Of Thigh And Knee

I unknowingly broke my tail bone about seven years ago, and at the time it only hurt the week it happened. About 3 years later, I was told that I broke it those years ago and that it was affecting me because it fused back together incorrectly. Now, I'm experiencing pain again, and wondering if maybe it's causing other damage.
If I sit upright for too long, I feel pain trace through my tail, the underside of my thigh, and in my knee. When this happens I can't sit still. Standing up and walking sometimes hurts also, I could collapse pretty easily under the severe pain.
I have had no treatment for it, I've only gotten a donut seat under doctor's recommendation, because they said there was hardly anything that could have been done about it.
I wonder if maybe spinal nerves can and are triggering the pain in my legs, or if it's a coincidence; Or if there are any other things that match better with my symptoms than nerves. I don't know if I could have developed any type of disabilities that are more commonly seen in elderly because I'm still a teenager, but if there is a possibility, I'm eager to hear.
Thank you for your time.