Talking to work colleagues

First of all to briefly summarise my personal history: I've had ongoing mental health issues (depression, anxiety, self harm etc) for decades now. I always thought I'd had BPD. After doing a MCMI test it highlighted me in the scales for a few different things but AvPD was the highest of my scoring.

So anyway. I have recently started a new job. My work history is... Sketchy. I tend to not stay in a job too long as I seem to either get bored of it, or I get panicky that my work colleagues will see through me and I'll be exposed as someone who isn't normal. I'm pretty insecure that people won't like me and that at work people will see me as aloof and unfriendly, or a little bit weird, or worse a freak. Basically I'm afraid of being "found out". I mean if people knew my history of depression, self harm, suicide attempts etc would that taint their perception of me?

I would like to try be social with my work colleagues but I just worry half the time I'll just say something stupid so tend to just maintain a low profile.

So how and where does one start? I'm not totally socially inept as I can and have made acquaintances at work in the past. But it's a struggle for sure. How does one actually socialize effectively anyway?