Am I eating the correct amount of food at the correct time of day?

First of all, I am male and 14 years old, I'm 5ft7 or 170 cm and 65 kg. Basically, I decided to lose a little weight and eat a little less than my GDA (Guideline Daily Amount). Normally I start my day off with a bowl of porridge with milk or cereals without milk. (I know it's unbelievable, but I hate it with milk). I'm then in school from half past 8 until half past four. I'm not a big fan of school food, and unless they haven't got my favourite dish or something special, I normally only have an apple or yoghurt because the rest they sell is just absolute junkfood. When I come home I eat a bit of fruit and maybe some bread or a small snack. I then have a fairly large supper later (7pm) in the size of a normal or smaller lunch. I know it is not good to eat no proper lunch and a large supper, but will the way I eat at the moment have a good or a bad impact on my body? If so, how and what will it do? Thanks in advance!