My parents are overprotective, help...?

Alright, so I'm not talking about wanting to go to some huge downtown party by myself, I'm talking about wanting to go to my friends house or go for a walk in our backyard. Seriously. I can't even go to any of my friends houses because my parents strongly believe that I will get raped by either my friend or their parents. My parents will not let me do anything by myself, simply because they think that every single woman walking her dog is a rapist. Once, I was allowed to have a friend come to my house, and the outcome was terrible. She had forgotten her coat at our house, and my parents had to wrap it up in 4 plastic bags using gloves. They said her coat could have been infested with ticks, marijuana, or disease. They then returned it to my friend, the bags and all... Do you know how hurt my friend was? My parents are now forcing me to get rid of all of my friends, as they say they will begin to force drugs upon me. I am 14 now, and I feel that I should be allowed some freedom. I've tried talking about this calmly to them, but they always insist that if they let me free, I will quickly turn to drugs, sex, and crime. I don't understand. I am a straight A student, and let me tell you that none of my friends have ever tried to rape or force drugs upon me. What should I do? I really don't want to lose my friends. They mean the world to me, and I'd die if I lost them. Thanks in advance.