I can't do it!

*cries*
I've been watching YouTube tutorials but the sound I get when I do it just sucks. The main thing is that my popping is way louder than my slapping and it just sounds crap, I can't dooo itttt. I can only make a good slapping sound on low E string open, everything else sounds rubbish... especially us you move to higher notes on the fretboard (i.e. closer to the body).
Does anyone have any tips? I suck.