I don't remember exactly when this problem started but now it is beginning to kill me. I am quite a brilliant teenager. The problem is that when ever I try to write in the presence of people, I become scared but when alone I will be relaxed but slow.

This as strange as it may sound, has been one of my major problems in life. It has affected me severely in many areas like exams and events which requires writing and and signing of names. In the case of exams, the fear fades with time and my hands stops shaking with time but while writing in the presence of people (especially if they are looking at me) OMG! The feeling is indescribable I will be shaking from head to toe and if i try to write on the book my hand will shake off. The feeling is somehow similar to intense stage fright. I can't just control it.

Recently, I was made the secretary of my club (I can't reveal details) but I stylishly dodged, out of fear of writing. Prior to this, before the club started, we were required to write our names. My heart jumped in to my stomach out of fear that the book will be passed around for everyone to write there names but I was relieved and at the same time deeply hurt when a guy everyone knows to be a school dropout took the book and calmly wrote down all our names.
Note: I very well know what to write.

Sometimes, I have even thought of taking alcohol which I don't take with the hope of getting confidence though I have never tried it. Please your contribution will be highly welcomed. Pardon my grammatical errors.
Mods please help me out.

You need to change your mentality.