How do I upload photos from Android phone to Google Plus without sharing? I would like to upload photos from my SGS4 to my Google+ without sharing to anyone. How do I do that?
If you turn on the "Auto Backup" feature of Google+, your photos will automatically be uploaded and will only be viewable by you (until you share them, of course).

If you want to do it manually, simply share with G+ and choose yourself as the only person you share with. I like to keep a Circle around with no one in it that I can share things to and so I'm the only one who can see them (kind of a "read it later" thing). You might prefer to do that, since it's quicker to choose a Circle to share to than a person.