I would very much appreciate if someone checked weather my translation is correct. Thank you in advance

Gerçek şu ki; hayalimizdeki insanın, hayalindeki insan değiliz. O kadar!

The truth is that we aren´t in the dreams of people we dream about. It´s just that!

Merhaba. I think your translation is correct. At least it sounds ok to me ^^
Maybe the ending could be "that´s all" instead.

Kendine iyi bak

Gerçek şu ki; hayalimizdeki insanın, hayalindeki insan değiliz. O kadar!

I have a dilemma , why that -ın doesn´t have a possesive somewhere? 

It´s there I think, just hidden in the longer word

hayalindeki

hayal (dream) + i (possessed marker) + n (buffer) + de (in) + ki

because it is a complex sentence, the comma can make you think there is no connection between

insanin hayalindeki (that/which is in the dream of a person)

thank you Henry, now I can see it, there it was .....

rica ederim