Crying when I drop her off at school

I recently put my daughter in pre school and this will be her third week. She only does 2 days per week to start her off.

She cries and screams every time I leave her. Now, I know it may be normal but I would think after three weeks that she would ease up and it hasn’t gotten better. When I pick her up, she asks if she has to come back the next day and when I say yes she starts to say she doesn’t want to. Mornings are awful, she cries and says she’s scared. I’ve asked her if the teachers are nice she says yes, But today she said the kids are mean to her. She’s only 3, so I don’t know how honest she’s being. It’s my first child so I’m honestly just really worried and I’m not sure if it’s normal. There is positive comments from her like when I pick her up, she says shes had fun all day but doesn’t want to come back. I’m lost