"When someone tells me "no", it doesn't means I can't do it. It simply means I can't do it with him", says Karen E. Quinones Miller.
In life, there are two sets of people affecting every dimension of humans; positive and negative people.
People with negative attitudes always see impossibility in every difficult situation; they are therefore not willing to take risk. Never be afraid of what you have a conviction to do. With on bold stroke, you can neglect all negative voices behind you, and get hold of those big successes ahead of you!
It is said that the same people who say you "can't do it" will be the same people who will say "we always knew you could do it", if at last you succeed.
Give yourself the chance to try and you will surprise the naysayers ever after.