Not turned on by masturbation?

Ivana-Sol
Like most, sometimes I feel horny and I say to myself "Right OK, masturbation is the answer!" but as *SOON* as my hand gets anywhere past my bellybutton, the whole feeling of arousal is gone (I mean D.R.Y ladies). I'm not a quitter so I try different approaches each time but nothing seems to work. Am I alone in this? Is it strange?