Communicate openly with your parents !
Whatever you're doing or whatever you believe in, explain it to them rationally and logically. Even if they don't agree with you, they will respect your opinion if they realize that you know what you're doing. If they are completely ignoring your arguments and are still totally against you, just let it go and be cool with it. It is extremely difficult for anyone to abandon their beliefs and conventions that were imprinted on their braina as facts while they were growing up. So, it is necessary to understand that there is a reason for their behavior and it's not intentional . After all, 99% of the parents just want their children to be happy. And, they are leading you to a path which they think is the best.