Your parents might very well wish to help you out in this situation. If you tell them how bad things are, they will want to be there for you. Thats what parents do. Despite of everything, the welfare of their children is the most important in a parents life. Since they were strongly against your relationship, they might be more that happy to help you get out of it. I would recommend you to ask your parents to help you, and don't tell your boyfriend about what you are doing to get out of the relationship!