I always finished all mine too Yasmine, I had to learn over the first few days though, its all about learning to stop when you are comfortably full as it takes the brain 20 minutes to register you are full. I now stop when comfortably full, even though I feel like I could eat a little more, but within half an hour I realise I am full.
Its all another new learning curve now Yas to stop us going back to old and bad habits.
Dont worry, you are not overeating, you are doing great.