ok. I have the exact same problem. When I am publicly chastized, or when I am speaking with the opposite sex even. I am extremely shy and even blush on the PHONE! why do I do this? its a mystery to me. I do think it'd be wonderful if we really could end blushing.
I'm in high school, and of course that doesn't help. I like talking to my guy friends. and they know that they're just guy friends and nothing more. but i blush when i talk to them nonetheless. I don't know why, and my sister's the same way! my mom doesn't know why either.
I wish I could help you but I am dealing with the exact same thing! I just wanted to let you know that you're not the only one out there.