HOW CAN I NOT BE AFRAID OF TALKING TO GIRLS?????PLEASE HELP?

OK I NEED HELP I SAW THIS GIRL AND MY FREND TOLD ME TO GO TALK TO HER BUT OF COURSE I WAS SCARED OF TALKING AND I DID NOT NO WAT TO SAY AND IM AFRAID IM GOING TO SAY SUMITN STUPID AND IM KINDA AFRAID OF REJECTION I WANT TO KNOW HOW CAN I BECOME UNAFRAID OF TALKING TO GURLS HELP PLEASE I CAN MAKE GIRLFENDS AT SCHOOL BUT I WANT TO TRY SOME OUTSIDE GIRLS LYKE GIRLS YHU DONT KNOW THAT YHU CAN GET TO KNOW PLEASE HELP HOW CAN I BECOME UNAFRAID TELL GIVE MEH SOME TIPS PLEASE