In Online Chess there about 110 players with ratings under 600. To see a list, first go to Online Chess (under the Play menu), then in the upper right part of the screen, click View Players, then enter a min of 0 and a max of 600 and click Search.
Your profile shows that you still have a provisional rating of 1200 for blitz and you have not yet played online (turn-based) chess. What makes you think you have a 500 rating?
If you are that low-rated you have almost nowhere to go but up and it won't take much effort to move up.
The absolute lowest rating I've seen posted on here is about 800, except for mine which is about 500.