You should totally just suck it up.
Run to her house and give her the whole: I love you and i want to be with you forever (keeping in mind that a teenage relationship lasting forever is about 3 months). Tell her mum that you feel like a total fool and just wanted be like those fools you see on TV - blame Zac Efron, blame the Kangaroos for making a chicken sex video, blame Brtiney Spears, blame everyone - say you don't know why you did it, you just didn't know how (*tearing up now in front of her mum*) else to have a relationship with her daughter, whom you adore very much.
That's what i would say if i were a complete idiot, anyways.