I was in math class, perfectly normal but once my teacher called my name , I started to get sweaty palms and heat went through my whole body and I started to twitch o.OHe just said my name and I went totally bonkers... Why ?

That's a panic disorder, and it is very common. I have it, too. For me, part of the condition is related to obsession with self - feeling that I am not good enough and smart enough or handsome enough.