Your thread title says, "help needed Please". You have totally destroyed the gear box, what help do you expect from us? What were you thinking dumping the transmission into drive at full RPM? Your age is mentioned as 18 years old (if that is correct). If you are 18 most probably the car is your dad's who spent his hard earned 17 lacs to buy this car. If the car is not yours, you have no right to abuse it. Now your dad has to fork out a lac or so on the rebuild. Keep in mind even after the rebuild your dad's car will never be the same. That is just not fair on your dad. In all fairness, you should pay for the repair.
Once you spend your own money to buy a car you can do to it what your heart desires .... drive it off a cliff if you like. Until then take it easy with other's things. Plus if I was your dad, I'd take the car away from you and give you a bicycle until you are fit to sit behind the wheel of a car.