i was same as you wanted to do it spent hours going round a quiet roundabout couple inches of the floor till finally it happened then it just seemed so easy dont know why i had struggled. went out bought some sparky knee sliders wore them out the following night, and have never tried since. i know the roads not the place for it but its part of the biking experience have ticked the box and no longer need to do it nothing to prove, have done a few track days and dont even try there as concentrate more on the riding and enjoying the day. be patient while trying when it happens you will wonder why you struggled so long and what all the fuss is about
