I understand you. I had a similar situation.

When I went to my first job, it seemed to me that there was a good team. I was very young and stupid then.

I was convinced that we should support each other, help, be friends. I really tried to do so. Especially one colleague tried to use my kindness, always asked to do part of the work for her, and I, naively, agreed, because I thought it should be so. But after a month I got tired of it and I refused her. Then she started telling gossip about me to colleagues that I am bad, and I dressed badly, and I behaved badly. From that moment, I realized that I don't have to be kind to everyone. I must think about myself and do my job. In my second job, I did not make such mistakes.