Hi Manipreet,
You have a few things in your favour here:
1. Your young age means a much faster recovery in most cases.
2. You're in very good hands. India is known as one of the medical centres of the world when it comes to heart surgery.
3. I'd say mechanical valves are the best option for you and the latest designs are proving to be excellent, i.e. the On-X valves. These are being tested at lower levels of coagulation and last a lifetime. The incidence of complications with these valves has been very low indeed.
You will be fine in no time! Take care.
Sensei