People have the wrong notion about humility. Humility is not walking around telling yourself and everyone else that you're a nothing. A person who does that is more than likely both arrogant and stupid. Humility is knowing that your potential and successes come from Hashem. As such, truly humble people actually have a higher potential than the arrogant, for the truly humble know that just as Hashem in unlimited, so is the potential that He gives each of us. As soon as we begin to believe in ourselves, we can begin to aspire.