I used to try so hard to reinvent myself and it drove me absolutely crazy trying to be something that I wasn't. Just be open to new experiences and people and push yourself out of your comfort zone a little after you leave. Both leaving the place that you've been comfortable in and gradating high school are big changes and they will already kickstart the process of finding yourself. If you're open to it, you'll absolutely find yourself even if you don't realize it in the moment. You've got this!