Am I the toxic worker? Or is my environment is toxic?

my workplace have gift of time in which if you hits the expectation you get to home and get paid when you leave early. everyone have been competitive with each other . I have been placed on multiple projects and task so many time throughout the year that I am burnout but physically and mentally. i can never be able hit the target and I get very upset that everyone else get to go home. when my boss placed me on a new project and expectation is so high with little support and time, i have asked if I can lower it. When I was told they couldn’t, I refuse be on it. Then the expectation got lower with another person was on it. i was placed on a project in which everyone seem to hit the expectation and get to go home. it took me awhile to hit the target as i did not know what to do and have little guidance. we just receive another project in which the people on it wasn’t hitting the target. Those guys have always complains on every project we were on. They could hit the target and when they couldn’t hit their number they refused to do the work and complain. my supervisor have asked me if switching project monthly was a good idea. I told him I don’t think so as I know from my experience that it can leave to burnout and the team mostly likely would not like it. He decide to have everyone pick out their project out from the “hat”( it was two box lid that form almost like a mouth) and to my “surprise” everyone who on my project got switch. one of my coworkers saw how it pull and noticed he didn’t shake it well enough to have the project dispense. now we are on it and sadly backfired on him and management as we wasn’t even hit their target. They lower it the target and instructed us to not really care about the informations. the team still not hit the target even with that information. Now I was close enough but even then I still don’t care enough as it is not worth it.

i might be a toxic worker as my coworker have iced me out from conversations or won’t talk with me for awhile. The only time they talk to me is when they need me to do something and vent their problem. Due To burnout as well of not meet target like I use to, I been declined to help out as much. when I am performance great, i can feel the tension in the air. One day I have overheard them who happen to be one of the “complainer” talking badly about me suggesting that I was ”slow”. This upset me and I have told my boss about it. I wish they have understood that certain material would take me awhile to process them as well of burnout but I won’t say it because no one matter what it won’t change their opinion. this betrayal have me rethinks my work relationship and refused to help. Am I just going crazy?

*sorry For my bad grammar