Many of the college profs don’t have enough space for all the undergrads, let alone HS students to do research in their labs. So thats why I suggested trying to find a research proposal that can be done without requiring too much time from the prof. Take a look at some of the projects that did well at ISEF in recent years. Many of these solve problems using creativity. A medically related project would be better if you’re interested in med school. There are loads of datasets that can be used for AI/machine learning approaches to answer research questions. These don’t require a lab, but requires solid understanding of programming, statistics and biomedical science.
It sounds like you live in NJ. Even if your HS doesn’t have its own science fair, you should be able to enter into one of the regional fairs that feed into ISEF: DVSF, MSEF, Rowan, Coriell, Jersey Shore, etc. I believe the DVSF has a program where they can pair you with a mentor. The key is to find a topic that has an interesting and creative solution. Doesn’t necessarily need to have the most cutting edge science, but should be clever.