I lost my virginity at the age of 14 when I had sex with myself the first time. I do not get your question heading this thread, but seriously, if you are masturbating yourself, then you are having sex with yourself. Period.
That has nothing to do with sin, and nothing to do with the Jewish vs gentile world. In both worlds, it is recognized that substituting the sex that occurs every now and then as part of a real relationship (like marriage, for example) with sex with one's hand and a fantasy dream, is acting just plain immaturely.
That never stopped me, though.
But why are you fixated so much on sex and 'virgin' status, on sin and chastity? The entire thing is a twisting of religion - ANY religion. The ideas have a place in Judaism - but not the fixation on them.
And I know plenty guys (including myself) who did not have sex with a woman until they were married - in fact, the overwhelming majority of my associates are in that category. And furthermore, the guys who are really bad off in this addiction using prostitutes and stuff of that nature, are usually the married guys. They got far worse as marrieds than they ever got as singles. So what the heck does being a virgin, single, or married, have anything to do with you getting well?
Nothing.
Whatever.
Thank G-d I am sober today, as are so many other Jews and gentiles in recovery, even though we do not deserve it. Life is so much better this way, and the gift is one that grows with every day. And anyone can have it.