I am trying to do my own usb to ethernet cable?
You cannot simply wire a USB port to an Ethernet cable and use the network. Your computer’s USB port does not use the same voltages and signaling standards as an Ethernet network. You can buy a USB Ethernet Adapte for less than $20 if that’s what you want to do. Here’s a link: http://tinyurl.com/clqfln Note: Wiring your USB port to an Ethernet device could fry one or both devices.