She’ll get over it.
But why would the other girl say that?

First you shouldn’t be drinking at your age as your to young. With your girlfriend just keep on telling her you never did anything make sure she knows how much you love give it time and she might forgive you

I have been in a similar situation as you what I did was I tried to get her back but I’m the end I knew she wasn’t going to forgive me the best thing to do is to move on