There are on-line critique groups. I stumbled across some a while back.
If you write science fiction, there are lots of resources. Here's a link to SFWA's page with links to on line workshops and the like: http://www.sfwa.org/2009/06/links-to-writers-workshops/
I agree that you should not post it here. It's far too open a place. Even a note that it's copyrighted is not real protection, because that can be deleted. And, to put your own copyright notice on anything you submit is considered the mark of an amateur.
See if there's a group nearby through MeetUp. If not, consider starting one of your own. A good critique group is fabulous, if you can get into one, or start one. I don't know about the rest of the world out there, but a lot of completely established s-f authors remain as part of a critique group.
I would also tell you to see if there are any nearby writers conferences you can go to. Many of the conferences are wonderful, put you in touch with other writers as well as, at least sometimes, agents and editors. You will got a lot from such a conference.
Good luck! Writing can be a lonely venture, and it can be very hard to get the feedback you need.
Oh, and where do you live? I'm in Santa Fe, and a few of us are just getting a brand new s-f critique group off the ground here.