I ate half a new york style bagel with cream cheese...did I screw up my diet?

today I ate the following:

eggs with sauteed mushroom and 2 slices of spam on the side for breakfast

then for lunch I ate a salad with poppy seed dressing, then for dinner I gave in, yet again, and ate a handful of cheddar cheese flavored sunchips (my weakness) with half a cinnamon bagel with cream cheese (chive flavor).

I feel really guilty about the bagel, so I'm going for a one mile run.

Does this seem like a lot of calories for a day for somebody who's trying to lose weight?
I ate half a new york style bagel with cream cheese...did I screw up my diet?
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