Samir, Nice lines. I agree with you that we need to have purpose of life. Charm of life is your enthusiasm, your passion for what you do. Of course if that can yield you money then nothing like that.

@ Shamita :: Answer to your Question “But is it advisable to leave everything which you do all of a sudden?..” is with you.
No one else but you need to make that decision, decision about how passionate you are about your Singing, do you have that kind of voice that can separate you in a crowd. Do you have that zilch of making sure that you will never repent on your decision if you take one against the odds.

Go for your purpose of life if you are that passionate.

Rest I believe destiny plays an important role, may be you were meant to be an engineer and something is in store for you in near future. You never know 🙂

To tell you my story, my family wanted me to become a Doctor, I ended up being an Engineer. Initially I used to crib but then I went to Onsite, saw different countries, cultures and start loving that part of life. Now I am working as a Project Manager and feels good that I did not become doctor. Can’t take that kind of pressure as well.. 😉