Adding to the chorus of well wishes. I had one at 20, too. It was uncomfortable, but it is a safe and legal procedure, and it only took a couple days to fully recover. You don't have to be afraid. :) The decision may seem difficult, and you may feel like "I would never in a million years be this person," but way, way more women than you know have been in your shoes.

If you can't have a child right now, whatever your circumstances, I think you're doing something responsible and brave. Good luck.