Once you understand this, you will never feel guilty again 

There is no right answer to that brother. I don’t know your current situation etc. However if you’re seeking this information at 19 you’re going to figure out the right path sooner or later. Best advice I could give is to follow your passion. Your passion is where you find excitement and deep interest. Your purpose will change as you evolve through life so just stay true to the positive energy (excitement, passion, fulfilment etc) and you will be on the correct path. You will find your way my friend. As I said, 19 and already asking these questions is a sure sign of promise. Keep going, work hard and always looking to become the best version of yourself you can be and worst case scenario is you end up being the best version of yourself you could be 👊🏽