fraud

You need to get a copy of your credit report. You should pull all 3 of them and look to see if there are any listed items that don't belong to you. If you find something odd you need to report it. It is important to check you credit reports every year and you can do so for free. Think of it as a health check up for your credit.

I think someone is using my social secruity number how can I find out

You can also go to the Social Security office and get a printout.

well, if you really feel that someone is indeed using your social security number then first check that whether you are a victim of identity theft or not. you can also file a complaint with the Federal Trade Commission. Check your Social Security record (call toll-free 1-800-772-1213; TTY 1-800-325-0778) to ensure your income is calculated correctly and keep a regular eye on your credit reports.