If your parents ban you from dating someone, it would be best to just listen to their words for a while, and see if this is more than just a crush that will be over within a week or so. If it's...
Unfortunately if she has already made her decision and is not interested you are going to have to let her be and focus your interest elsewhere. You cannot force someone to feel something or do...
My couzin used to and she says it was hard work but very very fun and she met loads of new people and shared stories with us about all her friends and teachers and my couzin now plays a backing roal...