Can you develop Selective Mutism in your early teens, or does it HAVE to have started in Childhood? Because I used to be very talkative, but when I was about 13, all of a sudden, I just couldn't say a word. It was like, I wanted to say something but it physically wouldn't come out.. A lot of people thought I was ignorant and stuff, including my parents, who still think that, and try to force me to talk to people. However, I was really loud when I was with my parents and my one friend who I've known since I was little, but even if I was around them, and there were other people around, I just could not speak.
I did think it was just me and that I was wierd, because I couldn't find any info anywhere about not being able to talk, but when I did find out about Selective Mutism, everywhere I read said that people develop it when they are still very young children. :S
I'm starting to talk around a few more people now that I've left school and moved on to college, but I still find it very challenging to speak in front of a lot of people.
Some people think they're born with selective mutism, but personally I think you can have it at any age since I only developed the symptoms when I was 10. It sounds to me like you have selective mutism. The good news is usually people overcome it as they get older. ^_^