I'm sorry your relationship with your parents isnt better. It sounds like they dont really accept you and appreciate you as a separate individual. That would make anybody cranky. It's like you have to defend yourself all the time. One thing i tried doing with my mom was asking for what i wanted - like telling her, "please dont insult me, or please apologize if you do." Well she did NOT respond very nicely.

But hopefully your parents might, like if you told your dad, "please dont rush me" or your mom, "im sorry if my opinion upsets you. That shirt might be your style but it isnt mine." Unless that sounds snotty - i dont want to get you in trouble. But asserting yourself like this will be good practice for you as friends try to get you to do stuff - "no i would rather go to a movie than rob a bank" or whatever