Don't know where you live and what the age of majority is, but most places if you're 18 you're an adult and do as you please -- you can move out whenever you want.

Oh dear, you did nothing wrong. Your mom should have been sex-positive instead of shaming you!

Also, are you paying rent for yourself next year or are your parent going to pay for that? In the former case, you're not forced to stay at home, at least technically.

You're 18, you're an adult now and your mom is just gonna have to get over herself.

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You’re an adult now.

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Both you parents have done the same thing with people at some point in their life. It’s ridiculous she is scolding you for like that.

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You're 18 who gives a fuck

So she basically tells you that you are a slut, a disgrace, and that you should stay home (so she can make sure you remain pure until marriage i guess).

Ask her how exactly did she raised you, like, to be a woman, or to be a housewife ? Ask her why she told you that you are a slut, is it because you brought the guy into her home or is it because of the sex ? If because you took him home, then tell her that this way you wouldn't feel forced to do anything against your will. If because of the sex then she is a boomer.

You should move out as soon as possible. She seems to have a toxic mentality. You'll probably have to take a loan, especially if you are a student.

Give her time to cool down and talk to her about this tomorrow in a calm tone. Tell her you're sorry and that you should've been honest from the start and that from now on you won't invite someone over without her knowing. Problem solved.