Parents!! AGHHH!

You'll forgive them eventually anyways. So you might as well. What did they say?

Yes. If you want to be treated like an adult, you should act like one. Try and be the better person, it will pay off in the end.
{I'm speaking from personal experience here.}

And even if your parents are rude to you sometimes, you have to remember that they are humans too and also capable of making some mistakes.
If you apologize to them, they might see how they have acted towards you.
And, they are the ones who have taken care of you, so even if they don't approve of what you're doing, you should still have respect for them. As hard as that may be.

Well if they say you shouldn't dress the way you do and call you a slut, you probably need to change up your wardrobe.

Yush,

I always apologize, eve if I did nothing~

I think you should sit down with them and talk (unless they were saying that drunk and don't mean it) like ask them why they said what they said, if they just say something mean again tell them to start atuação their age, and they have no right to treat you that way. Either sit down and talk because maybe someone has been spreading rumors... What did you do to upset them maybe they had a good reason or were over reacting...

Just apologize and say i wont ever do it again and try harder...but seriously, you MUST mean it and be sincere. They are your parents....they gave you life, food, shelter, clothes, ways to education, and finally love. Whatever they said may have been harsh, but you always know they amor you. If they didnt amor you, they would have thrown you on the streets already, so dont say they dont amor you. They have given you a foundation, and whatever they said was probably building mais to the foundation so its sturdy. Please dont make too much of it...just apologize and mover on with life you know?

Seriously? They called you stupid because you got an A-? How is dressing in the way you described make you a slut? Your parents are mental.. I would not apologize in the situation you are in.. I guess you can try asking them why they believe what they do. Maybe you can get your friend's parents to talk to them..