Have I eaten too much today?

Absolutely not! Actually you've eaten really healthy! Another apple is absolutley nothing to worry or hesitate about! I always have to have fruit after dinner to wash my food down with and I'm 5'4", 16 and 104lbs. Take up running, I used to weigh 115lbs and was 2" shorter, but now I run, eat more (but healthier) and am no longer skinny fat! Just skinny. Its fun.