People can only see what you share. Go to your LW Library window. Those files are being shared. Anything you don't want shared, right click & choose stop sharing folder or file.
The folders that are being shared can be set from LW's menu bar, Tools>Options>Sharing
People can't see you, if they browse you they can detect your ip # that's all. And the files you're sharing. You sound ultra-paranoid. So long as you are "careful" about what you share, you have nothing to worry about.