No, it is not heart breaking that you will attend Cornell, so a major attitude check is in order. You would have had a 95% chance of being rejected by HYP, then get stuck in the RD pool at other schools including Cornell with a low likelihood of acceptance and perhaps not as generous financial aid. If you need aid, ED to Cornell and a state school make a lot of sense, which your counselor and parents must have agreed upon.
As noted, you signed the ED agreement and part of growing up is taking responsibility for your actions. You have been highly privileged to receive counseling and a great admission with aid. Be grateful.