there is no such thing as 'i have fast metabolism'.. you simply are young and you have skinny genetics. every human being has super close metabolism so that is just a cop out excuse
as far as posts like this.. yes you will get forum meatheads who tell you that you need to eat 8 meals a day blah blah blah.. the bottom line is you are only 17 and if you start eating like a bodybuilder at 17 i 100% guarantee by the time you are 30 you will have all the health problems that these meatheads have especially with gut health
also don't worry about 'how many calories i am getting'.. that is another ruse made up by diet coaches to steal your money and make them look smart
let me simplify a diet for you that is going to be different then what other guys tell you and that won't fuck up your health.
eat 3 meals a day.. bread, milk, cereal, rusk (had to google what this was but it is on the list), chicken fingers, pasta, jam and all this other kiddie food won't build muscle..
healthy meals with natural whole foods will nourish your body. veggies, fruits, meats like grassfed beef, turkey, chicken, fish (not fish out of a fucking can but real fish).
eat a light breakfast, large lunch, and a moderate dinner. workout 4-5X per week, get on a good workout program or don't bother and you will grow into a man