How do I stop getting extremely nervous when reading or presenting infrout of people?

Practice makes perfect. The more you read or present in front of people, the easier it gets and the more comfortable you will become. Are you primarily presenting as part of school for a grade or as part of your profession? You may find it helpful to look for a group in your area that lets you practice public speaking. Toastmasters is a common group where I am from. People can practice making speeches and talking in front of others in a situation that doesn't impact your grade or job.

In my opinion it take time ,preparation and practice.when I was new in university I am was so so confused to talk infornt my class or teacher. Even one day teacher asked me to come forward and gave a topic randomly to speek for 5 minutes. My voice almost lost. But with the passage of time I gain confidence and able to speek in front of class and teachers. But still I am unable to feel confident during my interviews and voice viva... This thing hurt me alot I totally confused and look like I know nothing about any thing...