How should I tell my soon to be fiance who loves children that I am actually infertile?

Anonymous
I am currently in a serious relationship with the most wonderful girl in the world. She possess all the qualities I would want in a woman to raise my child, and she too has expressed her enthusiasm in our future child, except there is something in the way.
Two years ago, my then girlfriend had cheated on me with my best friend, and in retaliation I beat him up. She called me a violent animal, and attacked me when I confronted her. I did my best to defend myself without striking her, but at the end of it, she managed to get in several kicks and knees to my private parts. There was severe swelling and aching for a few days, and I did not want to seek medical attention out of embarrassment. When I finally did, however, I learned to my horror that what she did to me had ruined any possibility of me making a woman pregnant in future.
I made a report on her assault, and she received 12 months in probation for it, as well as paying for my medical fees, although the fact remains that I am now sterile. I suffered from depression after that, but I met my current girlfriend, and got out of it with her help and support.
My soon to be fiance and girlfriend of the present looks forward to someday building a family with me, and I do not want to stop that from happening by letting her know of my condition.
What should I do?
Updates
+1 y
To all those asking, artificial insemination is not possible as the kicks I received to my testes were so damaging that I cannot produce sperm. I did not dare tell her at the beginning of our relationship as the incident has already scarred me tremendously, and my self esteem was awful enough without her knowing I am infertile because a girl kicked my testicles that hard.
Updates
+1 y
Well, anyway, we broke up a month ago after she consulted some of her friends, and decided that she did not want to be together with me because of my infertility. We have remained friends, however, it is very painful for me to pretend it is alright when none of it is.
Again, thank you to everyone for sharing with me their advice and helping me through this difficult time. None of my friends know about this, although her closer friends did learn about it through her
Updates
+1 y
Now, I can only wish to go back in time to see a doctor immediately after my incident with my ex, and have a normal, functioning reproductive system today.
How should I tell my soon to be fiance who loves children that I am actually infertile?
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