Please check out the SSD forum. Read the stickies in particular. The same number of credits are not required for a 24 year old as a 30 year old. You might also qualify for SSI as well. Read up on both programs. If your disability onset can be documented to have occurred while you were 22, you could qualify for "children's" benefits on a parents work record, but would only receive them while a parent collects SSDI or regular retirement SS.

1/3 of SSDI applicants are awarded in the first stage. Doing your homework, getting the support of your doc, and accepting you have a long term severe disability will help.