I think it's time to show your responsibility as a man. If you really love your girlfriend, you must stand by her side firmly. You should let your parents feel your determination and let them feel that you have identified this person. If you say that you will never see anyone again after breaking up, then they will definitely listen to you. Don't say that you broke up as soon as they objected. This feeling is so unreliable that you are not worth trusting.
You should also try to show your parents an advantage in your girlfriend. The better you know her, they will recognize her. You know, a marriage without parents' blessing is doomed to be unhappy. If you get married reluctantly, if your parents treat her badly in the future, or make trouble in your small family, you will get divorced sooner or later, so instead of this, it is better to solve the problem at the beginning.
As a man, you must not hesitate to say, Oh, they are my parents, I can't hurt them, and then you think you don't want to break up with your other half, so you hesitate. In fact, in the end, you are the one who hurts your lover the most. In fact, she is not a fool. This reason is ridiculous. You know they don't like themselves, and then your boyfriend is not on your side.