I am 13 years old and me and im trying to talk to my mom about something?

ME AND MOTHER DONT GET ALONG VEY MUCH SO THAT MEANS WE ONLY TALK TO EACH OTHER WHEN WE HAVE TO SAY SOMETHING RUDE. I WANT TO ASK HER 2 THINGS WHO IS MY FATHER AND WHERE IS HE? I ASKED HER WHEN I WAS ABOUT 8 BUT SHE TOLD ME HE DIDNT WANT TO BE IN MY LIFE. SO WHAT SHOULD I DO ? I REALLY WANT TO MEET HIM, & I DONT KNOW HOW TO TALK TO HER ABOUT IT !!! HELP