When you try to think about what the mission or purpose of your life, you may not get a clear picture of it. Why? Because we lack clarity and intelligence for finding our real purpose in life. It is possible that you may have many goals and may not be able to identify the real one specific to you, how to bring that one mission out of your mind that will lead you to success.
Your connection with reality may be the foundation of your purpose. Not having decided your purpose in life does not mean you do not have one. It is not something you will just wake up to one day. You have to work hard to determine it. You may not have the option of choosing it as you have many choices and many of the choices may not even be genuine.
While targeting at your purpose, you will have to exhibit the ability to perceive it and you need to create a method to achieve your purpose.