Hey Kassy.
This is 100% rape. Did this happen recently? Either way you need to tell somebody. There threats are most likely just empty words, don't let them scare you into keeping this to yourself. Tell your parents. Tell the police. Tell anybody you trust. They should have never done this to you and it should never be done again.
I'm really sorry you've been put through this hunn. I'm here to talk anytime, if you ever want to talk about this or anything else don't hesitate to
PM me or keep posting on this thread.