I'm going to tell the waiter that I'm sending my food back.
Why, was your food bad?
They gave me the wrong order.
It's completely fin to ask the waiter to take your food back because you didn't get what you ordered. You shouldn't feel bad about sending it back because you deserve to get the food that you want.
Ugh, I'm tired. I should just eat it.
That's okay too, food is food and you might have gotten a better value too! But in the end don't you think it's best to speak up and get what you actually wanted, because they would comply. But anyways, enjoy your meal!