Everyone's caloric intake needs are going to be different, but don't just fixate on a number. Eat quality over quantity. If you're eating just to eat, that's not the right way to do it. And if you're hungry (not "bored hungry", I mean hungry), eat. Don't stress yourself out over having an apple because that's 100 more calories than you were planning on.
As for the number of calories - are you sure of what you're eating or are you guessing? Once I stared writing it all down and tracking everything, it was eye-opening.
What worked for me was being very, very regimented. I measured out my morning cereal, milk, juice, etc. I weighed any snacks (fruits and vegetables) and used measuring cups and a scale for dinner. When eating out, I'd stick to chains and other restaurants that publish their menus online with nutritional information. I tracked it all with the sparkpeople app and it kept up to date as I went. I've not been as diligent on that front the last couple of months and it shows. I've put a few pounds back on and I don't feel exactly right. I did get out for a run the other day and it felt great, so I'm really looking forward to a break in the weather. I don't mind running in sub-freezing temperatures, but we've had so much snow and ice, there aren't many places to run where there aren't huge mounds of snow and/or dangerous conditions on the sidewalks.