The more you think about transition to high school the more questions you may have and that’s perfectly natural. Hopefully the link below will help to settle some ideas in your mind. Be sure to talk to friends, cousins, siblings or the adults in your life about how you are feeling, I’m pretty sure they will have felt something similar on the lead up to starting secondary.
https://www.bbc.co.uk/bitesize/tags/zh4wy9q/starting-secondary-school/