was I malpracticed by my doctor?

Hi there, my name is Mariah, im 21 and suffer from facet joint arthritis in my lower spine. I injured my spine when I was 16, I had jumped off a rock and landed with my back, hips and my knee unbent which resulted in my joints jaring. I didnt think anything at first, it hurt incredibly and each time I sat down it was harder to move when I got back up and by the end of the night I couldnt walk on my right leg without my knee giving way. I was on crutches for a month before I could walk again and my doctor couldnt figure out what was wrong. It wasnt until a year after I injured it that she reffered me to a specialist because I wouldnt stop going to her and asking for help as to find out what was wrong with it. I had failed my courses in school which were mostly physical subjects as well as hospitality because I couldnt stand long enough and even lost my job because I could no longer lift heavy objects and wanted to find out what was wrong so I could try and fix it just so I could do the things I used to.
The specialist said I had a swollen disk and game me an MRI scan which he said at the time, had shown something but he wasnt sure and concluded that I would have to wait until I was 25 to get a scan again to see if I have arthritis and that he can only put it down as a mechenical problem in my spine. He referred me to a pain specialist who, as soon as I walked in the door, asked why I was so young yet suffering from an 80 yro's pain. Even after explaining injuring it, he told me, and I quote, "this pain is all in your head". He referred me to a psychologist who broke me down to the point of me leaving in tears because every session she would ask me how I could get past me back problems and every solution I came up with (change of jobs, different people I could see to help) she would tell me I couldnt because I had no money or no job or that I couldnt change that because I had back pain that wasnt being caused by anything.. I stopped the therapy and went back to my dr searching for answers, for solutions but she would give me a prescription for panadol osteo. Eventually after 3 years of trying I stopped seeing her about it, I realised my back pain would never be diagnosed until I get another scan.
Anyway, I was careless and leaned on the sore part of my back last month (2 years after giving up) and booked a drs appointment with my new dr. I told her about my back pain and she opened my file to look for the letter from the specialist but when she did, she found an unread letter from the specialist that I saw, from just days after his first letter, stating that after a closer look, he found that I have facet joint arthritis with synovial syst. This letter was recieved in 2012 and I was only told a month ago. I was put through therapy and ignored by my doctor because she thought it was all in my head.

Has this happened to anyone else and what can be done? I feel like I was wrongly treated and that if my doctor had done her job, I could be 3 years ahead of where I am now, I could have a job and a life and I could have had treatment before it got to the point it is now where I can barely clean my kichten without having to lay on the ground aching in pain afterwards.

I would love to hear from someone else who may have advice or are a young arthritis sufferer like myself and how they deal with it. Thanks.