Sorry, there is no such thing as a "witch gene". While it is true that one can be born with talents that are useful in being a witch, that does not make one a witch. To be a witch one has to decide that is what they want to be and then study and practice witchcraft until you understand and live what you are doing. Only then are you a witch.
As an example...a child can be born to two parents who are both musicians. But until that child decides they want to be a musician, sits down at the piano and spends hours and hours practicing scales and studying musical theory and technique they will never be a pianist.
Your abilities will improve with time as you study and practice. There is no short cut to get there.