It is good that you are figuring these things out now when you are 17, and not 45 and married
Part of what you are experiencing is a consequence of the Greek attitude towards Islam (specifically the Turks)--there is a bad history there, 90% of it being political. It is tough to work through those prejudices and historical grudges, but it can be done.
I think there are two ways to approach this: one is to show your family what kind of man you could be after embracing the Muslim faith. The other is to show them what the faith really is.
Ask your parents if they want a son who is cynical, adrift in his spirituality, hedonistic, and jaded, or if they want a man of firm convictions, who lives his life according to difficult ideals, believes in self-sacrifice, modesty, honesty, etc.? That second man is the good Muslim. How can they argue against this?
I use the term "jaded" here for a reason. In the CS Lewis books, Jadis is the White Witch who is brought into the world after men have become tired of existence, lost, cynical, uncaring, and apathetic. She extends her hand to those who have given up, and to take that hand is a terrible sin. So is it better to be Muslim, or to be in the camp of Jadis? They cannot make you embrace Christianity--you must choose for yourself. But NOT to choose leads one down a dangerous path.
If my son came to me and said he was reverting, I would be proud of him and support him.
As for the second option, showing them the faith, this is a matter of education. Introduce them to other Muslims if you can (there are open Mosque days in my area where you can go meet the Imam, etc.), show them youtube videos and blogs, and give them books to read. And of course give them the Quran.
Tell them why you left Christianity.
I left because
1. I cannot reconcile the Trinity, either theologically or rationally
2. Much of the New Testament was written long after the death of Jesus and is colored by the agenda of the authors.
3. Christianity was never intended for everyone: the 12 disciples of Jesus were to rule over the 12 tribes of Israel at the end of this world. Paul later "universalized" the faith to include everyone, but that was never clear from the words of Jesus himself. In this way the Prophet of Islam delivers the final message/revelation that is applied to the entire world--the Word has evolved, or has been revealed in its entirety.
4. Christianity is in a state of decay: its doctrines are unsound, its followers lack conviction and determination, and social scandals abound.
If you feel the same way, simply tell your parents. They have to respect this.
And if they refuse to support you, revert and show them how you live your life. They will begin to see that you were right all along.