That's amazing that you found a doctor who would give you a hysterectomy at 24, children or not.
You wouldn't believe how hard it is for women to get a simple tubal ligation nowadays. My aunt, who recently had her fifth -- yes, FIFTH -- child was scheduled for hers right after she gave birth to her last, and the doctor STILL wouldn't stop asking her if she was sure. She said, "I've had FIVE children; do you really think there's ANY chance I want to go through this again?"
With Endometriosis you get scaring -- each time you have a period you also bleed in other parts of your abdomen which causes great pain! With each period you get more scaring that will bleed with your period, -- and on and on it goes unless you are able to stop the process - most develop cysts that could rupture at any time - causing internal bleeding.
So, that's why a doctor would be willing to give a 24 year-old a hysterectomy. 30 years ago they were trying drugs, etc. to slow the scaring - pregnancy was one solution - though temporary - that is IF you could even get pregnant, which would be difficult. Personally - I waited until I could wait no longer due to a cyst that was developing. I was suffering almost 25 days of the month - in bed - on Excedrins - before I gave in at 37. I documented my health, and the reasons why I decided on not taking drugs to slow the disease, as well as why I decided on the surgery - it sure isn't an easy decision even IF you aren't planning on having children.