Many truly important things in life inherently come with a screening mechanism.

Those so-called "walls" that seem to block your way are often not fate rejecting you, but testing how badly you want it.
What you really need to be cautious of is not the difficulty itself, but mistaking all difficulties for "I can't do it."
Some walls are real thresholds of ability, requiring you to learn, accumulate, and grow;
And many more walls are just fears, inferiority, and self-imposed limitations.
Many people don't lose to reality, but before they truly start, they already believe their reasons for giving up.
What truly widens the gap between people is never just saying you want it, but after hitting the wall, whether you're willing to go back and continue to improve yourself until you deserve the place you want to go.