As miguel said you just arn't up to that stage of puberty yet. And unless you plain on getting someone pregant I don't see why you need it
It will come though. Do you know what stage you are at? if not look up tanner stages on the site search and there is a post I made that helps you identify your stage.
OF: If your name is 'loving girls for ever' why do you have 2 guys kissing? I sense irony!