My Try:

A day will come when one understands

that everything she lived was a lie.

What is left is love which she cannot leave behind

and loneliness which she cannot accept.

There is nothing else here but facile life philosophy and catchy sayings. That´s what we translate all the time. Check the translation forum and you will find lots.

Yes, you said it, ulak. It looks like the perfect explanation. Subjunctive it is.

But still it must be a shortened form, shouldn´t it be ne eyleyeyim?

You did help, I think I can use it now. I am just curious because usually Turkish sayings are very transparent but this seems more complex.

Your comparing it to ne yapayım makes me think. Could it be...

Could it be that in neyleyim letter -e- has a double role? It is part of the instrumental -le- but at the same time in a foxy way it is understood as a subjunctive marker, just like it was a verb. And what is more surprising, even a transitive verb.

What a jump from one part of speech to another if I have any clue.

Thank you, harp00n. Got it.

But I can´t understand what it consists of. It should be ne + ile + y (buffer) + ´I am´ maybe but if so what is motivating the accusative object?

Strange.

Is there such a thing as love any more? Everyone falls in love with what the eye can see. We don´t look at who this person is but at what this person can give.

One of them is too difficult for me.

Whenever I try to be happy misery knocks my door just like saying good luck with it.

Yesterday you said "I love", today "let´s break up". Tell me now: were you dishonest yesterday or today?

I could put it like this: I know people who ask for a road tax.

My reflexes were not that good. I couldn´t grab hold of you when you fell from my favour.

(My Tries.)

Neyleyim İstanbul´u?

It is another dialect/language (Azeri?). Negation suffixes show quite clearly, though.

No no no. Grammar is one thing and word derivation is another.

tunci explained to you how every verb can be changed into a noun when the syntax of the sentence demands it. The rule is generally applicable. This is grammar.

When a derivation suffix -giç is added into (a small group of) verbs usually names of an instrument or an agent  -  i.e. new words  -  are produced. You cannot apply the rule for any verb, and the resulted meaning is not always predictable. Only the part of speech is. This is derivation.