in the sun there is pudding
So to make sure I understand you. You want to take your identity completely off the internet. May I ask why?
Not only that but many sites just cant "remove" a users profile. It would cause problems for them to do that. And not only that, but the sites you have/had profiles on will still be visible due to Google (and others) archiving older pages. It can take a while for things to disappear.
I have heard of a few people talking about this "remove myself from the internet". My brother talks about this stuff a lot, and also about being what he calls "free man on the land". I just think he's nuts.
In truth you cant fully remove yourself because thats what the world is going to. There are ways (No I wont tell you, and no its not that conspiracy stuff) to find people in cases of legal or financial issues. If you are alive in a developed nation, have a drivers liscense, identity card, have ever had an address with a bill in your name, had a bank account, and so on....your in databases permanently. Several of those databases are run by the credit rating companies and others are governmental holdings.
So ya see, you will always be on the web.
Just food for thought.