Yeah, that's b.s. If he's threatening you, take care of it now. Get that out of your system now. You can not let anyone ever in your life let you feel that way. Especially if he's 18. He's an adult, and, you're a kid. Go to someone now and make it known what he's doing. You don't have to go into all the details on here if you don't want to. If it's serious, take it straight to your parents and/or even the authorities.