I've noticed that once I start messing up, than there's no going back, I may as well quit because nothing will go right with whatever I'm doing from that point forward. It doesn't matter if it's something I'm good at, and know by heart almost, once I mess up once I just need to quit, because It's just going to get in my head. I don't know how to not let one mistake get to me, can anyone help me out here?