If you have the necessary skills and aptitude to study medicine and become a doctor, you should go for it; if you don’t, then it is best you choose some other field to excel. One may serve God by shining in the work one does as long it is beneficial for humanity and is sanctioned by Allah.
Simply going to become a doctor because your parents or someone else wants you to do so is not desirable. It may even be detrimental to the community for as they say, “a half learned physician is a danger to health!”.
My advice to you is to ask yourself: what is it you want to pursue as a goal to excel and contribute to the community?

If medicine is the field you choose, go for it and focus on it and seek to excel in it. If you were to do so with the intention of serving Allah by serving humanity that would be an excellent act of worship meriting great rewards. If, on the other hand, your natural aptitude is to become a lawyer or writer or social scientist, etc. then go for it and try to excel and serve the community with the intention to please Allah. Muslims today are in dire need of social scientists who would use their expertise to promote the cause of truth and justice.