16 y/o male, how many vodka shots to feel a bit more confident in front of girls for the rave?

I barely drink, I'm 16 about 5"11- and 165 pounds / or 75 KGs. I've only had a drink once with my mates once which was 1 beer, apart from that maybe half a beer every 3 nights in 2 week summer holiday. Me and my mate are going to an under 18 rave so thought we might have a couple of shots just to boost our confidence in front of chicks just that little bit more... We were thinking 2 shots of vodka one after the other not empty stomach, but would that be enough? How many to feel a bit more relaxed, confident and fun? Cheers.