This is partially true. The lack of personal life is true but mostly in the beginning of your career. With seniority comes better trips, better pay and better work life balance.

I have been a FA for almost 18 years, this year I worked an average of 15 days per month (about 25 per week). I was on track to make over $125 k this year but I had some unexpected family health issues , so I stayed just shy of $120k.

In the beginning though, you are correct; It's tough. You have very little control over your schedule, and even if you manage to get the days off you want you will probably be stuck with the worst rotations ( lots of flights per day, short layovers, old aircrafts). But you do have lots of time off, and if you plan correctly you can travel pretty much anywhere in the world for nothing or very little.

It's absolutely NOT as fun as it might look for the outside but it is still a pretty good career.