[Nitro]

I think I'm the master of them, usually when I'm sad or happy I drink a lot with friends, however I always get way too drunk and black out. In those moments I do incredibly stupid things however friends have described me as the happiest guy on earth.
I don't understand why I black out so easily and how to avoid this. When I drink and I'm still awake I know what I'm doing however I can't switch from drinking beer to sparkling water. So I keep drinking and then comes the Pre-Blackout moment where I start drinking very much (I get shots at the bar) and kill myself.
What I hate the most is when I piss off a friend and I can't remember anything or I drunk call someone to "Tell the the truth about something". I also throw a lot of money and buy a lot of people drinks etc.
I want to find a way to still drink, but stay at the edge of the blackout, how can I do it?