Investing is a long test match like game. So idea should be not to be in too much of a hurry to do things. BE YOUR AGE. Enjoy life a teenager and a young guy enjoys at 19. 
This is an age that will not come again. Learning and earning is a lifelong process and never ends. Take your time to learn and earn. There will be lucky breaks along the way, and idea should be to make the most of them. Wait for a fat pitch opportunity which markets throw at you from time to time and at that time, dont hold back… Throw the kitchen sink at it and try to make the most of it but in a balanced way.
Do not deny yourself the small joys of life just for the sake of saving a few rupees and investing it. Always have your sights fixed on monetary goals and try to work towards them, but not by being stingy. Once you finish your basic education and get a job or start a business, cash flows will be enough to invest wisely, unless you develop expensive tastes.
If you are aiming to be financially free, try to set goals in terms of doing so at the age of say 40-50 or later on. Meanwhile if you enjoy what you do to earn besides investing, then continue to do so. After a few years of proper learning, incremental learning comes at a slow pace and often involves keen observations of how markets work and how companies perform and how markets reward them. These kind of incremental learnings do not occupy all your time and often investment is a lonely pursuit. There should be time to enjoy things to do in your life.
The big risk I see in starting learning and earning at a very young age is getting caught in the trappings of money and fame. Once that starts, the slide is dangerous. So idea should be always to maintain balance in whatever you do.