Why is it so impossible to get any job? Even simple ones.?

because the world its overpopulated.

Because capitalism never provides full employment. For employers it's "cheaper" to make one worker work 50 hours than two make 2 people work 25.
And if "too many" people have a job, wages will go up

many times i've landed in a new place and i'd take ANY job i could find... ANYTHING, no matter how gross it was. then i'd get my resume together and PAPER THE TOWN. YOU LITERALLY GO EVERYWHERE AND LEAVE YOUR RESUME. you visit the unemployment bureau at least 3 times a week - some states call it Job Services, whatever. but you make a JOB out of FINDING A JOB!! so if you're not our there working EVERY DAY to find a job then you're just not trying so why the hell would anyone want you anyway. show some initiative!!! get up off your asss, get off the computer, take a shower and go out into the world where the jobs are!

Getting a job is simple for the person having skills required for that particular job but if anyone doesn't have any skills that are required then it is harder for anyone to get a job. every job needs some skill.

It's NOT impossible.

Too many unemployed people

All except the menial work, has been farmed out by the Romney's and the Trump's to places where 8 year olds, work for two apples and a half a candy bar, per day.

Because the systek is against workers

You apparently don't have the kind of skills required to get a job. That can be remedied with some training via a vocational program.

Because you’re stupid

I'm on social security disability and I want to go back to work and not even McDonalds or Walmart has called me in for an interview. I got a job as a dishwasher (I'm vastly over qualified but a job is a job) and I couldn't take it because I'm cannot afford a car. Thus, no way home since the bus stops running. So here I am. Just got food stamps and medical coverage via welfare. I really want to work but I am over 50 and no one wants to hire anyone over 50 unless they really have to. Like needing a dishwasher.

I guess it depends on where you live. It's always about supply and demand. If there are more people looking for jobs than are available, you are in competition with other job seekers. If there are more jobs than people looking, then employers can't be picky and must hire whoever is willing to give it a go.

Apparently a lot of the time it’s to do with your CV, there’s a free CV checker online

In forty years I've only been out of work when I wanted to be out of work.... maybe 10 weeks of forty years. And I started during the carter era.

In that case, you might consider creating your own job and become self-employed.

may be their are no vacancies due to number of educated employers