Name this plant? 4 mons, 20', woody stalk,simple opp. leaves 12-18" across & heart shaped, fuzzy stems & lvs.

I had a plant come up in my backyard this spring. It's now 20' tall. I want to know what it is before I cut it down. It has now developed a woody stalk, leaves are heart shaped, simple, opposite, & fuzzy. The leaves are 12" across on the lower branches and 18-24" across on the upper branches. Leaf branches come right off of stalk. I thought at first it was a type of okra plant but it has never flowered or given fruit, nor have I seen one grow this tall. It came up voluntary on the north side of my house, full sun, well drained slope, edge of an old pine forest. I live in zone 7 in north Georgia. The stalk is as big around as my arm at the bottom and still pretty thick at the top. I'm not even sure if this is a weed, tree, or what. It seems pretty stable & continuing to grow. Because of the woody stem, I would lean toward it being a tree but really have no clue. Any help would be appreciated. I would like to cut it down if bad or keep it if it is a good one. Please help.