So long as you weren't fired, the issue is fixable. While it does suck that you spent so long underperforming and therefore not looking great to the company, just have a talk with your new supervisor about how you need to improve. Good luck, OP!

How do you not know if you're a good worker or not? Most people don't need validation from others to determine the quality of their work.

This is something you can easily fix. I mean, on your end you couldn't have known if you were meeting expectations/quotas. I'm sure if you explain yourself and tell them that you're willing to stay and fix this, things will be fine. I've had people tell me the same thing with previous jobs I've had. Most were understanding. I hope your's is as well.

Something about soaring with eagles and working with turkeys.

"You never found it odd that none of your coworkers joined you on leave-two-hours-early Tuesdays or communicate-solely-by-blinking Fridays?" "My old supervisor never told me I wasn't meeting company standards!"

It's hard to do well when you're not properly managed, hopefully your new supervisor will understand that and give you the support you need to get up to scratch

I feel like this is one of those scenarios where you assume you were a good employee because your old supervisor didn't say anything positive or negative. There's no excuse for slacking in work - you should know if you're underperforming or not

Where the expectations of your work never made clear? Usually they would explain goals/ targets to employees. Also, did you compare your work to that of your coworkers? Even with a lazy supervisor there should have been some indication

It's also possible your new supervisor has different standards and expectations than your old one. In any case you have to do what you can to meet the new expectations. Sometimes life sucks.

Incompetent and unaware: now there's a great combination.