Fist of all we should understand the difference between interest and passion. If you like something and you think. Kassh, I knew this how to play or how to make this or something other then this is Your Interest. But passion is something you want to achieve from your bottom of Your Heart. You are ready to achieve that thing anyhow, Means you have a strong burning desire to achieve your goal, this is called Passion.
But Now Question arises, How to find out Passion?
Many People don't have clarity what they want to do in their life and this happens only because they don't know about many careers option. So If you want to find out your passion, You should Know about different courses, means what will I study in that course and at what level anyone can reach from that course. When You will Understand about different courses. You can find out what do you want to work, What do You love To Work? When You will be able to find what you love to work then this is your interest. It became your Interest, Start working on it and Make a five Year Plan. Where do you want to reach? When You will fix your goal and you are ready to work on it then to achieve your goal your interest Will become Your passion and When You will be able to achieve your goal, then your Passion will Become your Profession.