Ever since I was a young child I have always felt that there was something great I was meant to do, something beyond what I was doing at any present moment.
It's something you were meant to do, not something meant to happen to you.
But it's also pretty terrible that anyone expressing the slightest bit of self-doubt or unhappiness is publicly torn to ribbons, or at best mightily condescended to. So normatively, people must talk nothing but fake, egoistic nonsense like "crushing it" no matter where their head is really at. And severe cases of Dunning-Kruger take over the world just by acting dominant and lying about themselves, while people with knowledge and potential are left to rot just because they are shit at marketing. (Marketing is important, but it is not the only important thing)
You are right, getting what you want requires work. But please recognize that reality is not fair and is often unpredictable. So people who don't have what they want aren't just inferior people who didn't work. They are someplace you could have been with nothing but different rolls of the dice.
Even though it is whining, it is not at all unusual or impossible to understand. A little bit of compassion wouldn't kill us.
Dave McClure's "late bloomer, not a loser (I hope)" is a great recent example. http://500hats.com/late-bloomer/
Add to that pathologically stupid stupid advice it evokes, and you would have to be pretty desperate for attention to post your private problems on the internet.
Haters gonna hate, but I usually just ignore them and choose to engage with the people who choose to engage with me.