Again, Im confused!

1.Do we really know where we are heading... Ha, Is there any destinaion? 
Actually what are we? Whats the significance of little living creatures like you and me in this "earth", which is one among the millions of cosmic bodies out in the universe. I dont know for sure that yours or my presence helps to keep the equilibrium or rhythm of
this universe. 
2.Why are we here? What do you think about the "meaning" of life? What I called
as the 'meaning' is the various attibutes and varibles and potential which drives and should drive my life. When we become sure about those variables, it provides with a purpose for which we are here. 
Is that all about life? Till this point of time, thats all about it... for me!
3.When I cease to exist in this world, there is no more "I" anywhere. Even if 
there is some part of "I" { my friend says its the soul} happen to exist, does this "soul" really know about my previous existence?  It shouldn't, right? 
So for all the ones who do "good deeds" in life just because of this fear of afterlife... Its pointless.


Cheers,
Tressy.