i was just sent a lettter from social security saying i didnt work enough to get social security. i was also told by social security that i would work

There are 2 types of Social Security disability: Disability Insurance Benefits (DIB) based upon your earning record and Supplemental Security Income (SSI) based upon Federal poverty guidelines. DIB requires that you have earned 20 quaters of credit over the past 40 quaters.  SSA is telling you that you do not meet this requirement.  You can ask SSA for a copy of your earnings record to check.  As for SSI, your total household income is applied to the Federal poverty tables to determine eligibility.  The medical requirement is the same for DIB & SSI. SSA turns almost everyone down.  You need to file for reconsideration and potentially a hearing when reconsideration is denied. You may qualify for SSD benefitsbased upon the severity of your inability to use a prosthesis.  This is called a "Listing." Regardless, you have appear to have a few hurdles in front of you and likely need legal assistance.  When and if you hire an attorney, make sure that you hire a local attorney who is well versed with these issues.