Well, if you prioritised saving for travel over saving for a house, you could afford to travel too, surely?
I travelled round SE Asia for 2 months for about 3k all in.
A friend of mine spent money on flights, had a few hundred quid in her bank for the first couple of weeks, went to Australia and spent months working shit bar jobs and farm jobs to travel about, stayed there ages.
Another friend of mine got a VERY good job straight out of school (highly-paid apprenticeship scheme with big employer), worked til he was 25 having bought a house and car, sold both and travelled for 3 years off the proceeds, getting bar jobs when he was low on cash.
Another friend interrailed for a summer - few hundred euro for the pass, stayed in hostels at 10 euro a night.
Other friends save £100 a month into a travel fund and once there's enough for a weekend break, they go away, rinse and repeat.
I know some people who do volunteering on farms around the world - you work a few hours a day in exchange for staying there for free.
I know people who bought a cheap knackered camper van and did it up themselves then drove round Europe for 2 years doing freelance work as they went.
There are plenty of ways to do it, you just need to decide what your priorities are. If you want a mortgage above all else, save for that. If you want to travel first, do that instead. Unless you're loaded (or your parents are) OR you live in an area with very cheap houses, you'd be likely to struggle to do big extended travelling, house, wedding and babies all before you're 30, but it's doable - save up a few grand each, do a couple of months travelling, apply for new jobs while you're travelling with the goal of starting when you get back, save up for house deposit for a couple of years, buy cheap house, have very cheap wedding, start trying to get pregnant...