The first failure is creation of barriers. The second is ignoring the multitude that is beyond yourself. Another is not seeing outside your own perspective. You are the greatest barrier to your own achievements.
Submit to initiatives more significant than yourself. Always be flexible. The fullness of life continually changes. One door closes, another opens. Practice finding the new door. Continually realize lost opportunity in every moment, harness the momentum into opening another. Turning opportunity around is a skill, developed when barriers are small, not when mountains must move.
Decide what you want, set goals just beyond reach. Be happy with your choice and do not tarry.
Accept failure. Embrace your shortcoming, love your difficulty, obliterate shame through acceptance and change your desire to what you have. Because it is what it is.
If you feel held back, know yourself and become what you are.