I think you are a bit tbh. But not really because of waiting a few years, more the attitude that "I know once you have DCs you can never get that time back"
Having children isn't necessarily like the end of the 'fun' part and onto the 'drudgery'. I have had way more fun post children than I did pre children with DH. Yes, it's new and yes, for the first few weeks months years they are pretty dependent on you. Literally attached to you for the first bit! But it's been such a better type of fun than what we had pre children and I love my DH and enjoy his company more than ever. There is nothing, nothing, nothing as attractive an aspect than to see your DH become a parent (and him you). The sense of achievement you can share jointly each and every day you don't accidentally kill, injure, harm your child (a common worry!).
Fwiw, you can still work (full time if you like) and you can still go out whenever you like - you just find and book a babysitter, and in 10 years, I have never once turned down an invitation for something I have wanted to go to. You can still have amazing, and adventurous holidays, if that's what your 'pre kids' fun is. Hell, you can even take them to one of the many child friendly festivals, stay in a tent and get muddy.
DH and I have been inspired to work harder and progress further career wise because we had children relatively young. There is nothing so inspiring as knowing you want to make the next step up ASAP as you have children to provide for.
Also, it is possibly you may not find getting pregnant as easy as all the contraception talks you've ever had in your life lead you to think... It's not a given it would happen at all, so perhaps better to start earlier.
But equally, if you decide against children now, or in the future, that's a very personal choice. But if I were you, I'd consider the possibility of waiting a few years and then finding out it is impossible for you. If the thought of that upsets you, then that's your answer I guess.