“Life is so unfair sometimes. All others except me are moving ahead in their life. All are becoming successful...”
Is that what you say or think about yourself daily in your life?.
Then my answer to this is that there is nothing in this world that you can’t achieve. As said by Lincoln, “That some achieve great success is proof to all or any that others are able to do it also .”
I say life is not always unfair to us; it is we who make our life seems to be unfair. Conditions of life are not extreme; we make them extreme! Each and every person are different and unique in this world. Every person has a hidden talent inside him, and they are not all the same except for a few. Remember that, as a man, we are born only once. We have only this single life to prove ourselves who we are. So use your full potential to bring out all that you have inside you, from your insight! Don’t do things in a common way, do it in an uncommon way and that is what is going to make you extraordinary from the others, from an ordinary. For us, as human beings, nothing is impossible in this world. All the human discoveries and inventions are an example of it. Work hard, have faith in yourself, be determined and above all be sincere and honest and success is all yours. As said by Nelson Boswell, “The first and most vital step toward success is that the feeling that we will succeed.
Never underestimate yourself and if others do it, just ignore it! Stop comparing yourself to others, and that day you will realise your value. Never lose your value and dignity in life. Be a valuable, special and responsible person in your life. Whenever you're wasting hope in life, motivate yourself. No matter how many failures you face in life, always keep your hope alive. Always keep a positive attitude towards your life. A positive attitude is man’s greatest strength. 
Lead a life to inspire than to fulfil your desires. Be what you are and be true to others. Give respect, take respect. Always honour yourself. Honour is a reward that we get for what we give. “BE HONOURED! FEEL HONOURED!” - for it is the most valuable gift, you can give it to yourself.