How can you tell when you are not sure of wat to tell ?

Fallen from a great feeling and stuck with the world of "I don't knows". Now, i have a one big question of somehow getting confuse sometimes. How can you tell you have really gone out from that place which you thought was the paradise you have ever dreamed of? How can you tell if you have forgotten the persons that made you belive that they were going to stay with you in that place? See how ironic it can be? They were the one who tells you not to go far away from you, and now, they are the one who had gone first. And you were the one who's trying your hardest to get away from the dream you had built. Now how sure you are if you really ain't sure what you should be sure of? Confused? How much more if there's memories that makes it more confusing?