Dear Meenududeja, please do not feel disheartened. Medical standards and fitness are essential in several jobs. Many candidates get rejected, and they have to accept it as a fact of life and look for other avenues.
I have personally known many who wanted to go into defense forces, including police, airline pilot, and several technical services, but were rejected on medical grounds. There is one case of a person in my earlier organization who was rejected as a Senior Operative (Trainee) because he was detected as having color blindness. However, later on, on compassionate grounds, he was selected for a very lower post of Pump Operator in the Water Supply Department of the Plant Township.
He was well-qualified, also a Post Graduate, and good at computers. During a special assignment, he was sent to me as a data entry operator. I came to know about his plight and found him to be very hard-working and sincere, despite the fact that he was very depressed that due to his color blindness, he was working at a much lower level than his friends.
I motivated him to take up the challenge and prepare for the Management Trainee (Administration) exam, which being of a non-technical nature, did not have 'color blindness' as a disqualification. He worked very hard and surprised me by clearing the exam on the very first attempt. It has been a few years now, and today he is a Senior Manager in the HR department.
What I wish to convey is, keep working hard to achieve your goals. Maybe, in place of a Teller, God wants you to become a Manager in that bank.
Warm regards.