I'll be honest, both these things are true:

It works extremely well, and I don't do it as consistently as I should, precisely because it's actually kind of hard work and the reward is uncertain and delayed (though it can also be enjoyable at the time sometimes).

So I'm also in the boat where I don't get the benefits I could get, I get it. Making it a routine is legitimately hard.

I just find it hard to believe that it wouldn't be beneficial to most people if they stuck with it, because so many human problems are caused by fixating on the past and future and ignoring the present.

I can't experience what it's like to be someone else, but based on what other people say and do, most people seem to be experiencing similar problems to me in this regard.

Having said that: if you have any kind of mental health condition like depersonalisation, derealisation etc, you should consult a medical professional before starting any kind of meditation programme.

These are powerful techniques that can be dangerous if used inappropriately by the wrong person