Parents!! AGHHH!

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

Yes. If Ты want to be treated like an adult, Ты 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 Ты sometimes, Ты have to remember that they are humans too and also capable of making some mistakes.
If Ты 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, Ты should still have respect for them. As hard as that may be.

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

Yush,

I always apologize, eve if I did nothing~

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

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

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