Hello, I hope you are doing well

You have two options here:

1. get your bachelors degree in engineering and get your masters done and then apply for PhD once you have completed your PhD and then you could officially title yourself as a DR.
2. Complete you engineering (which will already take your 4 years) then apply for MBBS (another 5 years of education) . Now, By the time you graduate from MBBS most of your friends from Engineering would have their own kids and by chance if you plan to study further such as MD or something higher , then it will take even more time.

I hope you understand, what's best for you.

Hope this helps. All the best!