Stage fright

Few days back in our insti we had a freshers welcome party ... My friend sings well and I had asked her to sing a song for the freshers... She agreed to that on one condition that I should sing along with her ... I agreed to sing and we chose a beautiful somewhat romantic song to sing ... Just before we got on the stage to sing I got stage fright and I was sweating like hell even though there was ac!!! I didnt want to go to the stage and sing... We had rehearsed the song and we were really sounding good together .. But once I got on the stage I got all nervous and messed up the song ... It was horrible and embarrasing ... After that song there were other songs sung by some little children and looking at them I thought these children have no stage fright !!! They just go on and say what they wanna say ... Nothing in the world ever stops them .. They dont think what others may think ... They dont think how people are looking starngely at you as though you are some alien from outer space ... I can safely say they just dont think... They are not shy to talk to people ... Why is it that when we become adults all the fear creeps in? Why are we so conscious? Why do we have to do some special things to impress people who may or may not be part of our life? Why cant we be so free as the bird and fly? Why cant we be free from all our fears ? I see the topic has deviated from the heading well I am just writing everything thats going on in my head right now !!! Hope i get the answers to my questions and soon !!!