How can I come to terms with the fact that so many people I know got into Harvard, when I've worked nonstop for my entire life to get there and didn't make it? It feels like I've just wasted my life and come up short. I feel inadequate.
As Mark Twain says, "I never let my schooling get in the way of my education."
If your focus was to get into Harvard, versus be well educated / get a great job / etc, then you've already lost.
Suck it up.