Feeling overwhelmed could it be burnout?

Tw: suicide and low mood

First time posting here and I'm feeling very overwhelmed by work situation. It is too the point that I've been crying and feeling useless all the time. I just can't stand it anymore and feel I need to shutdown. I have had several breakdowns and been diagnosed with autism in the last 2 years.

I work retail and it gets to the point where when I need help. I don't ask for it but instead mask the full I'll get it done over and over again. I hate talking to people especially if they are rude or trying to banter and it gets to me. I feel I myself am letting my team down internally and I just hate it. It's too the point I'm feeling seriously low and sucicdal I don't intend on acting on it but it's just the thoughts.

The funny thing is. When I'm doing voluntary work and been given specific instructions I'm happy to do the work and absolute thrive in it. I've been trying to get out of my work for the last 4 months and had a few interview but nothing.... I'm too the point of just breaking.

Is this what burnout feel or just me over thinking?