What should I do with my job? Are my coworkers mean to me?

I started my job as admin assistant (job order) in April and things seemed okay I thought until one of my superior (J) pmed me because she needed to talk to me. I went and she told me that someone in my job are saying Im slow to only one watcher and that Im saying things over and over again and that someone (that snitched) told my superior that she felt like I dont like them because I dont talk or join gossips. by the way in our office Im sharing table with admitting officers (regular) sometimes they are 4 or 5 people there group team helping each other while me only one who interviews at least 35 people or more in my 13 hour work shift. isn't unfair to report me to my superior? I mean sometimes the watcher in my front comes in group like Im the only one doing it sometimes the watcher asks too many questions and sometimes they will ask again what I said so I repeat what I said so I thought that might annoyed ( that snitched) that is only my problem I have to fix because my superior warned me that I have warning now and if that didn't change they will fire me. by the way I dont participate in gossips because me myself is also victim of that. One time Louise had wardrobe malfunction and one of my coworkers said her panties are showing and she said "I have an idol in office " in loud voice and Mika replied "I know her she has yellow underwear!" And they grinned like mean girls I thought its me because one time my yellow cycling showed and my coworker noticed it and it prolly became a gossip in our office that my underwear is showing. Also one time I was fixing my table connected to Mikas table like Im so OCD organizing things and Louise said to Mika "You should be careful you should not exceed the line in Sarahs (me) table" because our office table is very close and her chair is very near to me and Mika replied " She should be the one who should be scared of me!"in loud and angry tone and Louise replied " "You got period?"I thought its rude both of them
What should I do with my job? Are my coworkers mean to me?
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Because I didn't do anything to them. Im thinking snitched who snitched on me was Mika and Louise based on how they treat me they wouldn't hesitate to backstab and throw me under the bus.
Updates
1 y
Our office is like that picture its just table hence why Mika reacted when Louise said she shouldn't be crossing line our chairs are too close and our table is only one.
What should I do with my job? Are my coworkers mean to me?
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