Are they planning to fire me?

I started working on a job about four months ago. The job was in a total different field that I had no experience in. So yes I struggled. I think kinda bad. Because at one point it felt like the manager wanted to fire me. My hours were even moved around. The other manager did everything to show me I’m not a good fit, by even snatching things and even ignoring my job related questions. I don’t seem to be progressing in my eyes. I still feel I’m doing a bad job. My manager just hired 2 new people but the are already two people working here and it’s only room for 4? I’m nervous know because I feel once the get the people they need and they want there, they will get rid of me