What Are The Symptoms Of Endometriosis?

how can i tell if i have endometriosis? i am 20 years old, 5'3. I have had painful menstraul cramps since i can remember and have taken just about everything for years but nothing helps long. They feel like contractions. Ive had a baby so i know what that feels like. i also have had an endoscopy and colonoscopy done because i have had stomach/stool problems... which i thought was a hemrhoid but turned out to be a fisure.