The certainty of fate does not alleviate the ability to ignore it. When you deny the pull, you will eventually abhor it for not coinciding with the dreams you put before it. We were all designed with a purpose, though it could be something you've deemed worthless. However, it doesn't change the fact that you were designed for that. If your passionless and don't contest it, you may have missed your destiny's exit.
We were all made with a purpose. Some people know and find their's early. However, for other's being confident in that answer requires overcoming some obstacles or simple maturation. However, through that journey of discovery, don't forsake that you do have a specific purpose. Your purpose may not be at all what you've decided for yourself or what you think it should be. GOD has pre-determined your purpose and it is up to us, with his guidance, to find it. Understand that fulfillment of purpose produces fruit in your life. If you are not particularly fulfilled in what you are doing in life, then I strongly suggest you take a look inward to determine if you are actually answering the call for your life. Things you enjoy doing regardless of pay or praise are a few indicators of what you have been put on this earth to do. Assess your life and begin spending time thinking about what you can do for others. For at a basic level we were all made to serve each other. The key is finding out what it is you have to offer the world.