Op, another perspective if I may.
I dated- and then became engaged to- a Turkish man for about five years. He absolutely adored me, but it took him almost 18 months to tell his folks about me.
The thing is- Turkish men and women do NOT tell their parents about their girlfriends or boyfriends. It just isn't done. They tell their folks when they are ready to propose- or at least talk to their folks about wanting to propose. It's the way it is, and I can kind of understand it, because once you meet the folks, you are part of the family. I mean you call them mom and dad, know every aunt / cousin / friend / neighbour, etc, and your behavior reflects their family and their standing in the community.
So- he probably isn't sure right now, because 7-8 months isn't really long enough for him to know whether he is willing to bring you into his life permanently and completely yet- which is what he would be doing if you met the folks or were known about by close family members.
My ex and I were engaged for about a year, when his parents decided to visit Canada from Turkey (we lived in Canada at the time). Now, his parents absolutely adored me AND CRIED when we broke up, and I still keep in touch with them. They definitely knew we lived together, but even then - after three years of dating and over a year of being engaged and me calling them mum and dad- they still couldn't "know" we lived together. So I had to pretend to live at a friend's house whilst my ex pretended our big beautiful house was all his.
That's just the way it is.
I think, what you could do, is talk to him and try to understand his culture and the expectations which are placed on him, and on your relationship as a consequence.
Then, you have to decide if you can tolerate the bits of it that seem to clash so strongly with western culture and practices. It's sometimes difficult but there are many, many benefits as well. The Turkish culture is lovely and the people are just so kind and wonderful and caring and welcoming. But it is a different culture and different ways of thinking and doing come with it.
You won't be 'responsible' for his whole family, as another poster said. You will be closely involved with them, though- which has both beautiful advantages and frustrating disadvantages.
For me- it was worth it. We ended up breaking up, and actually, losing his culture was the bit I was saddest about (and not the reason for the break up, btw)
Hope that helps!