I hate my job already

I'm a first year teacher, I recently moved 3000 miles away (in the US). I was going to go to grad school this year but it fell through and got a job at the end of July. In my home state, elementary education is 2-6. I hated my student teaching in 2nd. I fell in love with 4th and 5th grade. In new state, its K-8. I was placed in a 1st grade classroom and told admin I was uncomfortable with that. "Oh we'll support you." I was told repeatedly. Coming from a state with classroom caps and my class is almost double that limit. Today was the first day and I was miserable all day. I like to teach, not babysit. I had an aide in the room all day and she didn't help at all. I had students that played all day and was very disruptive. Many students wanted headphones because it was too loud all day. Only one teacher per grade and I'm the only teacher in the grade and there were previously two kinder classes. I cried my whole way home and I absolutely hate it. I could go into so much more but it's just bad. I do not feel appreciated or seen. I'm the weird outsider that doesn't know what he's doing to them. I don't know what to do because it's literally the first day. I WANT to teach. I don't want this.