Is it normal that i have to eat certain foods like this?

i will give you two examples:

Pizza: i remove the crust and eat that first, then eat a slice into a circle , then eat it into a semi-circle, then i eat that into a uarter of a circle before eating the quarter circle whole.

Skittles: i fist put them on plate and put them in colour co-ordination, i eat ALL the purples in one because i dont like them, then i count the amount in each colour group and whichever is the smallest number, i reduce the other colours to that number by eating the excess in my certain order green, orange, yellow, red. once i have all the colours lined out and have the same number in each section i then put one of each colour in the middle of the plate, and eat them in the order green, orange, yellow and red.