It doesn't matter what other people get away with that you can't seem to let slide by. It doesn't matter what you think is fair or how often things seem to be unlucky for you. It doesn't matter how many more times you have to try than those around you.
It doesn't matter how other people got rich, built a following or became successful. It doesn't matter what other people think of your ideas, plans or goals.
It doesn't matter that you seem to have fewer answers than everyone else you know. It doesn't matter that they don't think you can do what you say you're going to do.
It doesn't matter that you've already tried and failed to be successful in the past. It doesn't matter what experts say about what you should be doing.
It doesn't matter. It doesn't matter. It doesn't matter. It doesn't matter one bit at all. There will always be excuses and reasons to whine.
There will always be people who are luckier than you, smarter than you, richer than you, better looking than you and seemingly more "problem-free" than you are.
No matter what you achieve, there will always be someone or something to distract you. Someone who, when you start comparing yourself to him, will cause you to stop focusing on what you need to be doing and start wallowing in wasteful self-pity. And this is why you need to stop worrying about what doesn't matter.