You're coming across a bit spoilt and childish, honestly!
Different generations have different advantages and disadvantages.
My gran's generation had to live through a couple of major wars, couldn't call in a doctor for sick children when she was a child because of cost, and she herself lost her only son to illness that would probably be curable now, women were paid less and expected to quit work when they had children, and there was pretty much no opportunity for university at all, or for international travel. But, she had good family relationships, a lifelong marriage (age 20 to 80s), good sense of community and my grandad was able to work throughout his life with a good pension on retirement.
My mum's generation (boomers!) got pretty good education through grammar schools, could mostly choose whether to go to university if they were academic enough or if not could walk straight into a job from school with pretty minimal qualifications, got to live through some pretty exciting social and cultural change, could buy really decent houses on their wage (from their job with O or A levels only), could travel a bit but again probably restricted by income. On the other hand they still suffered appalling sexism at work, a lot of relationship breakdown and domestic violence, quite a few economic crashes, Thatcherism, racism, homophobia, mental illness being completely undiscussed and poorly treated, and so on.
My generation (Xennial) paid uni fees although lower than your age group, still got student debt, couldn't afford houses until 30s, struggled to get jobs even with degrees, didn't get listened to at all as children (so if you went into school from an abusive home, or extreme poverty, you'd still be expected to just get on with work, and childhood mental health was ignored as basically we were all thought to be much better off than previous generations- which we probably were!), but then also got told we weren't proper adults at 20s. But we did (in some cases) get to take international flights- though like you I didn't until I was in my 20s and paid for it myself- holidays as a kid were in the UK and much less than once a year, we had to deal with much less sexism (but still a lot of homophobia), we got access to new technology from teenage/childhood, etc.
Your generation gets student debt and yes there might be restrictions on flights (but there aren't yet? So you still have time?), and like mine may have more trouble buying homes. You have better employment rates than some previous generations on graduation though, you get to study pretty much what you want and education systems are much more responsive to your needs (my kids have been able to access school counselling for example, which didn't exist when I was in school, and are taught about rights of the child), you don't get bullied for being gay (hopefully), you get good medical care free from birth to death (which will be when you're much older, so have more time to travel later in life), and you get massively listened to because the media seem to think you're "millenials" and therefore important, even though you're actually GenZ. You aren't going to have to go to war (unless you choose to join the military), and you probably aren't going to get sacked for getting pregnant. If you're rich enough to be considering travel straight after your degree, you've pretty much won in life's lottery.
Also, you might like to google Greta Thunberg. I think you'll find she's actually younger than you (and has a much wiser perspective!)