depeche hello! Welcome aboard.
I do understand where you are coming from and having had my first sober night out with friends recently, i felt the same. I felt the conversation was stilted and I wasn't 'myself'. I almost decided that in future I'd have 'just the one' when out. Just to help the conversation, not for me 
Then I tried again and realised that I was full of shite. I didn't drink, I wasn't dull or boring and could chat, feel excited, engaged and had fun. The difference was that the second night I was too busy enjoying myself to think about drink, whereas the first night I sat gazing at my friends drinks feeling a bit peeved. I had a crap night the first time because I had made it into a big deal and I was feeling crap.
However, it was not as crap as getting so drunk that I missed a train, vomited on myself, fell over in the street, made unsafe decisions, make a twat of myself, jeopardised my career or any other things I have done whilst drunk. It was just a slightly crap evening. I got over it, no lasting damage.