Someone's opinion shouldn't be your reality. It is necessary for you to have your own dream and to achieve it. Break the barrier that people set for you. Break your own goal. Show people that you can do more than the minimum, that you can achieve greatness. The movie "Forest Gump" shows a metaphor where Forest Gump's leg braces fall of after him running away from the bullies, or the negative energy in his life. He broke the barrier and pushed himself. His friend Jenny also helped him with breaking his barrier by being one of the few people who believed in what he could accomplish. It is possible for you to make your dream a reality, no matter how big or small.
