First, knowingly lying on your application can, and likely will, get your application rejected or, if you are accepted, it will get your admission rescinded.
Second, you may be doing pretty well, but you really have a somewhat over-inflated idea of your own cleverness. Do you actually think that you are the first kid in the past 40 or so years to come up with this “brilliant” idea? Do you actually think that the admissions offices of these colleges do not have ways to figure out whether you are lying on your application? There are a dozen indicators on your profile which will raise up red flags if you claim to be black. Your Guidance Counselor will have to support your lie, as well. Moreover, colleges like Harvard generally want to interview you, especially if you are a serious contender.
Finally, admissions can be rescinded even after you have started attending college. So the moment you walk in there, and you are obviously not black, there is a very large chance that your admission will be rescinded at that point, if you are lucky. If you are not lucky, you will be expelled, and the lie will then be on your college records.
So the consequences of lying about your ethnicity or race to receive a boost in admissions chances can be pretty severe.
You should be asking about ways to make you application excellent, not looking for dishonest shortcuts.