This is a very large debate in the study of philosophy. It deals with what we believe vs. what is actually true, and how we can prove that it is true.
I believe it was Rene Descates who thought that in order to establish what we can prove to be true we must start from the beginning. Thus he asked the question "How do I know that I exist?" Because without his own existence, nothing else could exist to him. Thus he observed, "I think, therefore I am."
If you can think, you must be able to think with something, and so we have a self. Anything beyond that could merely be a deception of what we call "the mind." Everything you see, everyone you know, everything you believe to be true could all be the product of your mind.
From this way of thinking what I am writing now could merely be a construct of your mind, one that it is using to answer a question that your conscious self has proposed. Its all very abstract, rather confusing, and overall unendingly fascinating.
As for the meaning or point of this life, that seems to be just as abstract as Descartes' system of beliefs. It seems to be just as transparent and ever-changing as language or social structure, and just as those things can vary and be viable within different cultures, so can the "point of this life".
I feel that there is no real underlying theme that we can appoint to life that surpasses living your life to the fullest everyday, and dealing with the blows as quickly as possible so you can get back to enjoying what time you have on this earth with the people you love.... Or the people your mind has constructed in order that you have someone to express an imagined emotion for. '