

Remind yourself as often as necessary: that’s entirely your boss’s fault. Nobody is perfect hence I know you made mistakes, you human you, but telling you one set of things to your face while spreading the opposite things to others is just such a dick move.
You have some kind of worth, so don’t let your boss gaslight you into believing that crap that he spouted. Even if some portion of it were true, you obviously can’t trust the source. Find a better source of judgement - yourself even if you have time to heal although it sounds like not, so someone else in the meantime.
Touch grass, seriously, it will help - both the nature and the exercise part. TV has its place too, especially in healing, but you’ll want more than that as you regain your confidence. The good news being that YOU are in control of that!:-)
(I am no psychologist tho, just my personal thoughts)
I am currently at 100% of the people that I’ve told about Lemmy irl actively chiding me for having mentioned it to them. It doesn’t help that (1) Lemmy.ml is the #1 Lemmy instance in a Google search, and (2) that instance uses Local rather than All when you don’t have an account. If someone told me to consider joining Lemmy.ml, and that first couple of pages of content were all that I saw - especially just before any election in a Western nation - well then now I understand their reaction perfectly, as it is the correct one!?!?
Conversely, PieFed has a number of features that Lemmy lacks, one being the ability to actually block all users from an instance (rather than merely mute communities but not actual users on it - leaving them free to troll you in other communities, reply to your comments, trigger notifications, downvote your content, etc.). Since blocking lemmy.ml, I have had zero regrets, and enjoy interacting with Lemmy communities much better:-).
The real biggest problem that Lemmy has is lack of users and overall dearth of niche content - which ofc wraps back around to why would someone willing come here to be bullied just for being a mainstream centrist or even “leftist” by USA standards (Reddit is based in and its largest userbase is from the USA)?
Bullying is why Lemmy will never grow. That, and how the tools are somehow even more authoritian than Reddit - i.e. there is a modlog but no modmail, nor notification of a moderation event, instead the modlog simply says that a “mod” did something, if you go to the trouble to find out why nobody bothered to respond. And worse, on Lemmy.ml you’ll find yourself banned from communities that you’ve never so much as heard of, citing having broken a rule that seems not written down anywhere. The lack of transparency is very reminiscent of the spez.
Fortunately, PieFed and Mbin offer non-Lemmy options to the Threadiverse.:-)