You get more nervous in front of a lot of people. That's why, when you play a concerto, you play with a small orchestra, in some place where you don't feel that it is as important as Carnegie Hall.
This young wine may have a lot of tannins now, but in five or 10 years it is going to be spectacular, despite the fact that right now it tastes like crude oil. You know this is how it is supposed to taste at this stage of development.