It's just you and the pitcher. And everybody is watching you. It's kind of like when you have to stand up and speak in front of class, or to a group of people. Except this is something you wanted. That stuff's encouraging and all.
People mean well.
But it's not especially helpful. Actually, it makes it harder. You feel like you're letting those people down if you strike out. There's a trace of fear as you step in. The ball is hard and it's moving fast and it really stings if it hits you.