HHHEEEEEELLLLLLPPPPPPP!!!!! School is starting tommorow!! HEELLP! I'm going to 5th Grade!!! And my brother is going to Kindergarden, HHHEEELLLLPPPPP!!!!!
3:00 isn't late. We get out at 3:30 and have to be in homeroom at 7:00. If you think 3:00 is late and 7:00 is early, no offense, but I wouldn't hesitate to call you spoiled. Just go to bed early and you'll wake up early.
It's all going to be all right. For me I moved into a new school in 5th grade(moving onto sixth this year!), it was confusing at first but a lot of fun. If anything it makes the year more exciting. The only other thing I can say to you is to chill and roll with it. You'll get used to it eventually.