Endometriosis

Hi guys. I went on Nexplanon last August because I had just awful periods. Nothing has really changed since I went on it. I started doing research and found that I have or have had every single one of the symptoms of endometriosis. 
So I was just wondering for those of you who have been diagnosed, would I know if I had endometriosis? 
I have an unusually high pain tolerance (played soccer on a broken ankle for 4 months), so I'm worried I've just been brushing off what is exactly abnormal pain.