Bad behavior as an adult and inability to hold down a job because of bad behavior, does not a disability make. Most people who are turned down for SSDI do not have sufficient medical and/or work records to back up their claim; it is not an "easy" way out but the individual does not get to decide they are disabled and cannot work, they have to literally have societal records and prove it.
If you do not go to the doctor regularly, do not have written or employer first-hand confirmation of being fired because you cannot do the work (because you are disabled, not because you "don't get along" or "nobody likes you" or you don't arrive on time or call out too often, without your employers' knowing and trying to accommodate your doctor's diagnosis of depression), then it can be a very long, hard, even impossible road to getting disability income.
If you keep getting new jobs and trying to work, or work fairly successfully part-time at a job, you may not be deemed "disabled" enough. There are people who have a disability and work and those who have the "same" disability and don't work; where's the line? With mental illness, it can be hard to find. I have a good friend who is quadriplegic, in a wheelchair, and every time he is laid off from a job, he has to re-apply for Social Security! He loves to work but is slower than others because of his disabilities so when there is a downturn in the economy, he's usually laid off sooner rather than later. So, looking for work or not working for work, where's the line?