Im 17 and there has never been any pleasure feeling when doing clitoral masturbation. why is this so? how can i fix this?

Don't worry: The clitoris is often covered by a thin membrane ( hood) which can be gently retracted exposing the entire nub of the actual clitoris. Never rub too hard, Use an aqueous lubricant and very, very gently, use the tip of one index finger in increasing small circles, both clockwise and counter clockwise. You are also young and much of this is related to hormonal stimulation and increases with age.

Here are some altern: There are several alternatives that you can try. In some women, other areas like the Vulva and or vagina can be more sensitive to stimulation. Alternatively your boy might be able to help you to do it better. Just keep exploring and you will find your own erogenous zone with time and practice.