First of all, if you have loved ones that would miss you if you were gone, never finding your body would be very traumatic for them, and would prevent them from getting closure. There's also an issue that if you disappear like that, authorities might suspect foul play was involved. So I'd advise against this if you have family or friends that care about you.
However because I don't know your situation, I'll assume you've thought this through and don't believe that to be a concern.
I think the only way youd be able to do this is if you went somewhere in the woods, or in the desert, and walked far off the path, where nobody would assume you would be. And you would have to leave your phone switched off prior to travelling there, and not make any card transactions in the area. I think based on your post history you might be American. If so, somewhere on any of the national hiking trails would probably be easiest. If you go out to California there are hundreds of miles of desert, so taking SN, or using a gun or something like that after having walked for a few miles off the path would possibly do it. But youd have to get there without leaving a trail that you'd gone out to the desert, as a helicopter search would possibly find you if they knew the general area you were in.