Often the biggest difference between people who successfully complete major life goals, and thus fulfill their biggest dreams, and those who do not, is what might appear as almost a delusional conviction and commitment to one's vision and process, despite all naysayers and obstacles.
In fact, this is especially important to keep in mind, because the world will rarely support and affirm your dreams, and instead tries to remind you of why you should be fearful, and believe you are inadequate or incapable in some way. You will thus need to learn to keep going towards your dreams, despite the audience that will most definitely try to dissuade you or deflate your motivation.
Then, from day to day, if you can learn to maintain a strong belief in yourself, even if others have their judgements of you, often your dreams become ever-closer to a reality.
At the end of the day, it truly is between you and yourself. What anyone else thinks, doesn't matter. This is your life, not theirs. .