Is education guarantee of bright future?

No it is not. The only one who can determine your future is you. An education can increase your career opportunities. Still, you must define what a bright future means for you. Is it a career, money, family and friends, contentment with what you have, good health, etc. The critical issue is that you must acquire a vision; a clearly articulated picture of the future you intend to create for yourself, and the benefit it will bring to others as well as yourself. Your vision should be based on passion; a love for what you want to do. Once you acquire that vision your path will become clear, and your future bright.