How to be unnoticeable?

HEy guys, im switching schools back to a school with my childhood buddies (not really buddies) that I hate, and because we have history (not good not bad, we just know each other because we went to the same elementary and middle school), they will no doubt be able to recognize me. What are some ways you guys suggest that I can use to be super unnoticeable so that i can just associate with the people i wanna associate with and kinda start off clean instead of being dragged to the people i used to know?

thanks
How to be unnoticeable?
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