I embarassed myself for like 4th time while speaking infront of my class.?

your not a coward first of all......ur just shy, if there is anything coming up, for example u have to get on stage and say something...plan it before you go and do some excersices like train in front of the mirror..u prbably have stage fright or ur scared to talk in front of alot of people..its ok to be shy, just kepp practicing and you will be fine.