You are not alone in the way that you feel. so many of us feel like that sometimes and for some of us its alot more often than not. I know how it feels, being trapped in your own head and like the world around you is a movie you are watching.. you need someone to talk to, and i know its not easy. I think you may start to feel better, even communicating with people online, who know how you feel, who understand because thay have been through or are going through the same thing.i was always very lonley when i was younger, painfully shy and just couldnt communicate. It just got better over time. i was alone in my head for years. but things got better, and i hope that thay will for you too. You didnt mention your age.. Its not until you reach your 30s that you know who you really are (well for me!)and your teenage years especially are a difficult time. Some find it easier than others..not me! but i got through it and i was ok, and stronger after the difficult times. communicate with others how you feel,like you have here. And can you try to talk to a therapist or even a kind relative or teacher? someone who will just listen to you without judging you. Good luck