It is tough, vodka, but it means you're over investing each time.
Most first dates are 'failures'. There's no chemistry, no spark, they may smell a bit. They may smell wonderful but are rude to the barman. They may freak you out in some way. Or, more likely, they don't smell bad or wonderful, they're nice to chat to and it's a shame that you don't fancy each other, nevermind, NEXT!
You don't have to be confident in the sense of being Wonder Woman. You just have to be you. You're not trying to win them, or, to be fair, them trying to win you.
You're just meeting someone to see if you get on. You probably will, but won't fancy them
Don't overinvest and you'll be less nervous. It's a night away from the tv, with the possibility of something great. But it's unlikely to be that great thing, especially if you're stressing about it.