Congrats on your first LD oumoumad! 
The first questions are best answered by yourself, since it’s territory of dream interpretation, and that is best practiced bu the individual that know best, that is you. Here’s an article on it to get started 
Dreams are believed real because we do often go by life doing the same, believing it’s real no matter what, and trying to give a posteriori explanations for what happened, instead of questioning the actual facts (like when someone would tell you a lie, and you could just believe it and reshape your thoughts and beliefs around that, or you could unveil it by doubting it first, and then finding out the contradictions later). An aware state of mind helps to achieve such an objective, check Lucid Living for an idea of what I’m talking about ^^
You can’t remember everything because you have to be more determined on that, and improve your DR. Check the Knowledge base for that 
And lastly, things didn’t look like their WL counterparts because dreams are the realm of imagination, and it would be boring if everything was just copied from WL 
but there’s always the possibility, if you have a clear enough visualization, of replicating exact scenes and places in your mind and bring them over to the DW if you want.
Good luck with your Quest!