You did have an option to give it to someone less privileged - The option is not taking it yourself so that someone who is at higher risk likely gets it, which is what the program was trying to achieve. In a world of limited supply/capacity one person getting a vaccine simply means another doesn’t.

I’m not from the states, but your post does seem to be the stereotype of American culture of “seek individual benefit at the expense of the wider community”, I.e. “I didn’t technically break any rules, so why am I being berated for jumping in front of other people who are more in need?”.