Honestly, the thing I will always tell people who experience this is to call emergency services on the person making the threats. Either you've saved them or taught them a lesson. Either way, it's the best move you can make.
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This is the biggest lie we tell our kids. Not everyone is college material, nor do they need to be. You don't need a degree. You need a skill that you can sell to someone for money, and college is just one way to get that (or at least convince someone else that you got it). Just find something you're good at and run with it. That may or may not require a college education.