What I am nervous or worried about on Teaching Practice

I am worried and excited about how I will work and deal with student because there are many thing of them and everyone has their own personality and come from various environment so I think it will be difficult to me to join with them. I nervous if my teacher chose for me Primary schools due to I think they are older and they will understand I am not really teacher so they will not respect me. I prefer Kindergarten schools because they will be flexible more than Primary schools. I worried if some children have problems and I can't fix it. Also I think if it not easy like what I think. I but I believe every thing will be okay and it will be wonderful experience so I will do my best to make this experience and attempt to fix the problems.