You seem to be getting bad advice. Before you do anything, analyze what your situation is. Hopefully you've researched the implications of a short sale.
The timelines may be different, but this is generally how it works.
If you've missed 2-3 mortgage payments, the lender will file a Notice of Default. During this time, you may be able to still stop the foreclosure proceedings --- by paying what you owe, negotiating a modified loan, or selling before they foreclose.
A short sale is when a property is sold at less than what the homeowner owes the bank. The bank, with prior approval, may forgive the difference. It used to be that you can be taxed on that difference which the IRS considered income. But this changed with the Mortgage Debt Forgiveness Act of 2007.
In another 3 months or so, if you have not satisfied the lender's requirements, they will go ahead and institute foreclosure. And the lender can also begin the process to evict you.
A foreclosure has the same drastically negative effect as a bankruptcy. Your credit score will take a hit 200-300 points. With a bad credit score, you will have difficulty getting loans, not just for a house, but for other major ticket items like a car. Is this something you are mentally and emotionally prepared to do?