First of all, I congratulate you on getting admission to a good medical college in your first attempt. This is something you should be proud of; not regret. Thousands of students each year are unable to even get admission.
There is no doubt that some medical colleges have a better name than others and maybe the teaching there is a little better. Not all fingers of the hand are equal. You might be surprised to know that a large number of colleges across the country may have facilities and teaching that is inferior to the training at Nagpur.
Medical college teaching is different from school teaching. Much of it is self-learning with guidance from teachers. In the long run, where you did your under graduation from matters very little. There are several examples of medical luminaries who graduated from lesser known medical colleges; yet excelled in their respective fields.
I would advise you to leave all these issues behind you and get on in life. This is only the beginning of a very long journey for you. You have done very well to come this far. There is no reason why, with diligence and perseverance, you will not make it to the top.