Sir, I have no confidence, I have suffered failures in my studies. But now I am bit doing well, but still I have fear within me. I become very nervous while giving seminars, even when I explain something about my subjects I will become nervous and my voice will become shaky and eventually I start crying. Help me please. I have joined M Tech; there I have to give lot of seminars.

Lack of confidence is a very common problem but crying is unusual at this age. This suggests that your problem is severe enough to go to therapist for one to one therapy. He/She may teach you self-hypnosis, Visualization and other necessary techniques.