If you haven't pursued any form of help or support from professionals iyn a significant way regarding these issues, particularly if it hasn't been any time recently, it doesn't make sense to seek Supplemental Security Income [SSI] or Social Security Disability Insurance [SSDI]. They are both programs based on disablement to a degree where one cannot fully support oneself, and this disablement must be recognized by the Social Security Administration for one to be eligible.
They make these judgements usually based on clear consistent evidence of poor functioning despite treatment, referencing various medical records, self reports and assessments.

If you haven't sought treatment there is no clear case for unavoidable disablement but also, as you touched upon, there is no evidence for medical evaluation- the opinion of a medical professional.

As lit fuse has said, I really urge you to seek professional opinion and care regarding your concerns.

ETA:
Here are two links with info on the two programs-

http://www.ssa.gov/pgm/disability.htm

http://www.ssa.gov/pgm/ssi.htm

To address the treatment part: I, personally, would start with a clinical therapist or social worker. How you tell them what you are experiencing is up to you. Telling them what keeps you from functioning specifically without labels is probably a good start.

Maybe even make a short list, I have often found that helpful when I have more than one issue to address.