I too am in the same position as you. My parents are extremely religious. I attended a private school and wore a scarf and wore clothes that did not even fit me(they were extremely baggy). As I started to attend public school I felt sad for everyone because I truly did think that they were all going to hell simply because they were not Muslim. Having told that women are supposed to cover their body really did mess with me. I started to hate my body, I hated being a female, I hated who I was. I felt like I couldn't be who I really was because if I did I would be disappointing my parents and would probably going to hell. This lasted for around 4ish years until I left high school and went to college. (I don't really believe in the concept of hell).During the year that I was leaving high school, I took off my scarf. I was the first one out of all my Muslim friends to take it off. To me, the scarf was a barrier. It restricted me from being me. I couldn't act like myself because I had to keep this reputation which I did not want. I did get comments from people saying that I was going to go to hell. At first, it did bother me, but now it doesn't. Anyways, you said that this is your last year of high school, I would suggest to move out and find a group of people that are more accepting. I think your parents are not just super religious but they are also strict. I always thought that if I were to talk to any male I would go to hell. I wasn't told this, but it was just how I was brought up. My point is that you can make friends which are girls in Islam. I'm not sure why your parents stated you can't but you can.