Get some wood

Regardless of size, you know how to play Minecraft, and you know you cant do anything till you cut down a tree. So you find the nearest tree and walk over. The walk takes what feels like hours, and by the time you're at the base of the tree, the sun is already setting. But no time to worry about that, you just need to cut down the tree. You punch it, and within a couple seconds, you break off a chunk of wood proportional to your size. You want to gather more, but the sun is setting, and you don't want to be around at this size when the zombies start to spawn.