Uff... Why are you afraid? After all you are compromising with your career. I have a friend who is just like you. He just wouldn't give the exams for the fear of it. He feared like - "what if I didn't clear it, what would my friends think of me, what would my parents think of me.." and all sorts like this. We pushed him a lot, even had the placement officer call him home to appear for the writtens. After a lot of advising he gave the exams...and surprisingly he cleared it. But, he couldn't clear the technical round as he was thinking a lot on the negattive aspects of the interview...
So...why are you waiting?