Hey...
Nothing is impossible here if your focus dedication and hard work is on the same path to your goal you can't loose anything.
Let me put you a question: you have the chance to learn about the most complex and most thrilling and joyful science, at the same time it will provide you enough money and respect in the society. It is the top profession in the world and you are provided a chance to join it. Millions are willing to sacrifice their sleep,food and daily routines they practiced past 2 decades of their life just to be a part of the elite group. what are you willing to do from your part ?

Consider this story. Exam is like a running race. When we grow we morphed ourselves into different animals. Some are physically strong and can lift heavy,some run fast. If u put the strong person to run fast along with the sprinter,he will fail. Because the sprinter has put decades of practice in running to be able to achieve that speed. If the strong man chooses to join running race,he should be willing to put atleast the same amount of time and effort as the sprinter. If he puts enough effort he can equal or even beat the sprinter. Brain function is similar to this muscle exercise. If u put it into practice,it will work better.

Exam result = intelligence x hard work

If ur IQ is avg ,then increase ur hard work. Because the scores are finite number,u can achieve the result.

But please be aware that u need to work and study way more hard after joining MBBS, to get into PG course and then into the specialty course. Because after ur MBBS it is a race among the horses who were trained exclusively for competitive races,so it ll be hard. And medicine is a life of more than a decade of studying hard and competing for each and every level.

So if u r ready for that lifestyle, u can proceed.if u will ever be going to give up, it better be now. Because never give up attitude is needed not only to study medicine but also while treating a patient.

And to answer ur qn, is it hard to become a doctor? Absolutely Yes. But is it impossible? NO.

All the very best.
Go ahead set example for yourself!
See yourself in the next 5 years you will definitely be happy....
Regards!

Hii!
Yes offcourse. A student who thinks himself or herself as an average in studies can do mbbs too. But most importantly, he/ she should be ready to dedicate and focus on the goals. Work hard and smartly to reach to the goal. The initial stage here, is to qualify NEET UG entrance exam. If you can do it, you can do MBBS too.
Hope this helps.
Good luck!