Social(ist) Security was implemented into law by Roosevelt as part of his "New Deal" and is, unfortunately a requirement for just about every job and various other aspects of your financial life. So, if it were possible to get rid of it, you probably shouldn't. Personally, I think everything that you earn should be paid directly to you.
The creation of it is entirely socialist (hence the name) as it assumes that you must not be responsible with your own money and incapable of supporting yourself as you see fit. I also don't agree with it doubling as a form of ID. But we're stuck with it.
The government declaring you as a corporation is a separate issue entirely. In fact, in some cases, you can escape prosecution by denying your name in all caps as your actual name. Most people don't know their laws, and just submit to all the frauds our government imposes on us, such as paying income tax. There is NO LAW in any legal document that states that the people are required to pay income tax. Call the IRS and ask them. They'll only give you the run-around, or just hang up on you. Many IRS agents have quit after discovering this.
There's a lot of stuff to know, and I suggest checking out author and speaker Jordan Maxwell. He goes into detail about all this kinda stuff. Also, check out the documentary called America: Freedom to Fascism.