mental health

I suffer from a lot of mental health issues. I have been to hell and back. After the WORST time of my life things are picking up again slowly. I have a new job and I start on monday. It's a full time entry level to a field I really ***think*** I want to go into. But right now instead of feeling good I am absolutely distraught. I cannot stop crying and panicking. I have been unemployed for over six months now. And my two previous jobs were part time. I have never worked full time. My last two jobs ended in me having very public and embarrassing slow coming on mental breakdowns that resulted in me essentially convulsing and crying on the floor. (I'm honestly disgusted and embarrassed of my entire life tbh)
My mental health still sucks. I have been going to doctors about it for four years now and I have nothing in place. NOTHING. No mess no counselling no groups no appointments. NOTHING. They don't fucking care. And now I'm just waiting for the next god damn breakdown that's gonna ruin everything again. And I'll be stuck unemployed living of my parents in my childhood room until I kill myself. 
I'm only 21 but this is too much and I have absolutely nothing.