Privacy is a nebulous concept, and it's possible that in some cases, we give up privacy, and in others, we don't. It's not necessarily a binary on/off thing that you either have or you don't. I don't believe that people who say that privacy is dead are correct; or if they are, it's a very narrow view of privacy. You still don't have people watching you in the shower, for example. (Hopefully...)
Check out Daniel Solove's work- here's a good start.
"I've got nothing to hide" and other misunderstandings of privacy
He's got some other interesting articles on the subject there, and some interesting books as well.
There are still things you can fight for to protect privacy, even if you are giving up some facets. You can fight against ubiquitous surveillance, and continue to do the things that you're doing to protect your privacy. You can help make threats to privacy transparent, for example, by supporting groups like EFF.