Oh having a baby is a larf, go for it.
Parenting is fine, it's what you make it. You don't have to buy into all the fluffy crap, spend a fortune on Brora baby cashmere, wear milk-stained maternity tops, or put a 'little princess on board' sticker in the back of your Porsche. It isn't compulsory to spend pregnancy sitting by an open window in a rocking chair cradling your bump and staring mistily into the middle distance (though you might think it is if you read too many of the wrong kind of pregnancy books). Giving birth doesn't suddenly make you morph into a different human being from the one you've been for the previous however many years, you just carry on being who you are, and you and the baby sort of muddle through and get along as best you can, and have a lot of fun into the bargain.
I had my first in my mid-twenties entirely accidentally at an age where when we announced it we could see people having an internal struggle as to whether 'congratulations' or 'bad luck' was the appropriate response. Lots of people reacted as if we'd said we were going to give up our lives and move to Wales to breed goats. Actually some of the time we felt as if we'd volunteered to give up our lives to breed goats. But it isn't like that, really. And then I had my last when I was nearly as old as you (clearly I hadn't got any better at counting to 28 in the intervening 13 years, as my dh helpfully pointed out). But she's lovely too, and it's still a lot of fun, even though it all still drives me a bit mad from time to time, and my house is not as clean as it could be.
Some things will have to give a bit, you can't quite "have it all" -- but you can have most of it if you're lucky, and easy-going and have a supportive partner. You'll sort out some childcare and a work-life balance that suits your set-up. You'll still meet up with friends, and some of the time you'll talk about babies, and some of the time you'll talk about Middle-Eastern politics, or Grazia magazine, or what are the best boots to wear this autumn. You can drink wine and go out to restaurants.
The baby-in-tow bit is fun as well, and you can adapt it to suit you. You don't have to go to mother and toddler groups if you don't want to, but you'll find that there's a lot of fun to be had messing about, hanging out, watching a small person who is partly like you and partly not like you do their stuff and grow and change and love you.
It's a lot more fun than having a kitten.
Oh, and congratulations.