Hi Sanjana 

You have the first thing it takes to become a good doctor, which is 'desire'. It is the first step towards achieving anything. 

The next step should be, to substantiate that desire with equivalent competency and expertise. Build in you the knowledge level and competence of a good doctor.

Do your studies with all your heart and brain, not only theoritically but practically. Appear for the medical entrance exams (NEET or AIIMS or JIPMER or ALL) and join the best college possible. One step will automatically lead you to another. All it takes is to begin! 

I hope it helps! 
Do well! Wish you all the best!