To be Successful, you need to acknowledge and respect your achievements.
Success is the achievement of something consciously attempted.
There are many things that we attempt in life, like, trying to control our hand movements as an infant. Each achievement, however big or small is success. At any point in life, there are many things that we have achieved (Successful), and there are many things that we have not achieved (Unsuccessful).
Most of us normally feel unsuccessful, since we are tuned to focus only on what we have not achieved (Do Achievements make you Happy?). To us Success is a moving target, because with each achievement our focus shifts to the next desired achievement.
Success is relative. We feel someone else is successful if he/she has achieved what we have not achieved. However that someone else also feels unsuccessful, since there are things that he has not achieved, and others have achieved.
Success is a feeling, emotion or a state of mind, similar to happiness. You can feel successful at any point in life if you are willing to acknowledge what you have achieved. All of us have made significant achievements in life. We simply refuse to acknowledge them.