Unfortunately, it's not unusual to have at least one placement that doesn't suit you. Some schools are more welcoming than others, and it seems (for whatever reasons) that this school doesn't tend to embrace students. You've had a good observation with your tutor, and you're half-way through now. Are you in a primary or secondary school? I'm sure a child wouldn't have mistaken you for another child if you are in primary, and even if you are in secondary you must have done some teaching in the class by now - perhaps it was just a language error? You also need to acknowledge that the teacher you are working with is struggling with her own insecurities (becoming a qualified teacher doesn't make you a perfect human being). You are a student, not a child, so you should be able to take that into account. My advice would be to decide not to take your difficulties with the school personally, focus on getting all you can from the placement and then move on. Trust me, developing a thicker skin will be very useful as you continue your teaching career!