Sure?

What makes one sure that he is a normal human being, I personally am not totally aware of my past memories, there seems to be large defects, the only proof of it is the memory i made out of paper, but sometimes there is a page missing, what happened then, isn't it possible that that date harbored some terrible event the memory of which is repressed after a severe nervous breakdown i had then, sometimes you can see it in the eyes of those who surrounds you, their eyes reflect the fear of the past crawling over to our present, it is like the eyes of that who is looking at someone at the edge of an abyss; standing by; he fell before and he might as well fall again: standing by not sure if he can save him, probably not, it is just too far. The eyes pray at every glance; god have mercy on us and aid us that it never happens to him again, the fear and the anxiety carry a clue to that missing page, either inside a tomb or splashed with Someone's blood. why is it that we get so emotional to a certain pattern some drama scenes or life events, for no particular or apparent reason, is it something close to what have happened to us, am i getting closer to remembering what had happened to me................
Perhaps normal is just an opinion.