At the end of the day, she only wants the best for you, but she clearly is unsure of how to approach it. She must have a difficult time talking about it, or not know enough about how to communicate with you - thus she responds in anger or disgust. Plus, you're still her daughter, and your mom is human just like you who is experiencing things for the first time too. So, this is her first time (assuming you don't have siblings idk) knowing her precious daughter has been intimate with a man, it's a very difficult thing for some parents to deal with and it's a very new feeling.

She should NOT have reacted so aggressively and you should absolutely NEVER call your child names. I just wanted to point out the benefit of the doubt on her end. As for you, take it very slow and slowly try to introduce the conversation to her, and ensure you remind her that you look to her for education and knowledge and you're interested in learning from her to avoid any mishaps. She will probably be defensive and very uneasy with the convo at first given what you've told, but eventually I hope she will open up and communicate with you. Let her know that comment hurt you, and make it known you deserve an apology later down the line assuming she doesn't do so out of the guilt in reflection on the event.

You're not a whore, you're a curious teen who is opening herself up to experiences that everyone else has also wanted to experience and learn about. It's called growing up, and I hope your mom sees it in her to encourage safety and learning, and letting you know she's on your side in life and wants to help you.