Why cant i OLLIE! =[ =[ =[?

hi im a girl and im about to explode i practice every day on my brothers skate board trying to ollie i just really want to ollie and prove to my brothers friends who are just beginners that i can do better then them and show off ;) i really need help :( plzzz what i do is i stand on the skate board then i bend my knees kick the nose and slide then jump but when i pop it, It makes two sounds and after it does that thats when i slide but i find it so hard to slide when i hear the pop! and when u bend ur knees do u take ur foot of the nose then kick the nose? or do u leave ur foot on the nose and just push so hard to get the pop AHHHH its so hard some times i change the way i do it and it gets confusing :( i need alot of advice just tell me how the hell do u do it in one motion step by step PLZ!