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Hard and easy are subjective terms and different for each individual. They mostly depend on your interest. If you like what you're doing, the harder it is, the more challenging it is, the more you enjoy it. E.g., if you like crosswords, once you get the hang of a particular difficulty level, you'd like to move on to a more difficult level. If you like batting (in cricket), once you can face a bowler easily, you'd like to move on to facing a better bowler.
So, you have to decide if that's what you want to do, then it will not be hard for you. Don't listen to people who discourage you. You are the best judge of your ability.
What to expect:
Medical studies involve studying a large amount of data. The amount of information you'd have to grasp will be higher than most people studying other subjects. But as I said before, if you like that and enjoy that, it will not be hard for you. After the pre-clinical years (theoretical studies), you'll move on to clinicals, which involves working in teaching hospitals and studying actual patients. It will involve long hours.
After you finish MBBS (4 and a half years) you'd have to go for 1 year internship. Then residency. Then post-grad studies in your chosen specialization. So, be prepared to be in education for a long time. You'd still be studying when many of your friends would have been in their jobs for a couple of years. It will take at least 7-8 years to be a doctor.
Regarding admissions:
Medical admissions in India are based on entrance tests. So, make sure to start preparing for them as soon as possible. Even now is not too early. You'll have following options:
1) You secure a good rank, and you'll get a free seat in a government college and would complete your studies with very little money spent on fees, accommodation, etc. which means not a lot of burden on your family and no debt. That should be your first target.
2) You secure average rank and get a free seat in a private college. You'll have to pay a decent amount of money for fees, etc. but still better than the next option.
3) You secure a low rank and have to go for a paid seat. That means spending huge amounts of money as donations to the college. If your parents can afford it, it's ok. Else, you end up being in debt when you graduate.