Once people are adults, part of dating is learning to accept that most people do have a romantic and sexual past. She has had other partners. You have had more. If she wants to be with you, she needs to find a way to focus on the present and to celebrate that you, after so much experience, choose to be with her. You can’t do that for her. All you can do is repeat that yes, you’ve been with others, but you want to be with her now and give her all the reasons why she is special. Then it is up to her.
One other thought: It may be that she worries that you give up on relationships too easily. Ten past relationships at your age is unusual. She may need reassurance that you are willing and able to work on a relationship if things get a little rough between you — not just walk away. I hope that’s the truth. Every relationship goes through some difficult times. If you are committed to this relationship in ways that you were not in prior ones, you need to find a way to tell her so that she can believe.
I wish you well.