If you want forgiveness, start by showing how sorry you are. For example, a nice gesture would be to say you want to go round to the shopkeeper, apologise sincerely for all the trouble, and offer to do some task to make it up to them, like cleaning the shop window or washing the van. If you tell your parents you want to make amends, instead of being defensive, they're likely to be less strict. But you MUST then keep up your end of the bargain, or you will lose their trust again.