My preferred night out is a Thursday night when I go to choir practice at 7-30, and when that's finished, a few of us go to the pub. We sit in the pub, and yes, ok, we do drink beer, but it's real ale not lager, and we're not pouring it down our necks at a rate of knots (with the exception of the choirmaster, his first pint barely touches the sides, but he teaches at a pretty rough school and so can be excused) and we sit and talk about anything and everything until they throw us out of the pub at 11. And we can be very adult, or very childish. Same group of people came to my birthday partly last May, and we played pass-the-parcel and other childish games. And I'm one of the younger ones in the group! Approximate age range is 25 to 60.
The others have got it right, you do what you want to do.
Another example of preferences: My sister got married in August, and she had a hen weekend, where we went to a hotel, had a nice meal on the Friday night with lots of drink, some drinking games, etc, and then on the Saturday night went out in Manchester to go clubbing. Not my sort of thing at all, but because it was my sister, I went along with it, and it was ok. I've decided that should I get married, my ideal hen do would be a girlie sleep-over, all chick-flicks and everyone wearing pyjamas and sitting up all night talking and so on. Of course, given my group of friends, we will be having drinks, but not with the intention of getting drunk, more on the lines of "ooh, that's a cocktail I've not tried before, does anyone else want one?"
So don't worry about it. Do what you want to do and only go out drinking when you feel good and ready to do so!