Markup /qa/2312

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>>2310
Age is an important factor. As long as you're still growing your metabolism is gonna be much faster i.e. more calories are burned (even if you don't exercise). It's called 'basal metabolic rate' or BMR. There really isn't anything you can do right now to change that. You just have to wait until your body finished growing and your metabolism will slow down. For men that usually happens around the age of 18, but for some it takes until their early twenties.
In some cases an unusually high metabolism could be attributed to hyperthyroidism, (but that usually develops later, in your early twenties) so maybe ask your doctor to check your thyroid levels (again, unlikely at your age)
I wouldn't worry too much about bulking or gaining huge amounts of weight right now. Just stick to your exercise routine, yes even the cardio (it's le good for you) just maybe don't overdo it (as you don't want to burn too many calories), if your goal is to put on muscle. If you're having trouble with cardio, don't worry. Most people hate doing it, I certainly hated it for the longest time until I grew to actually enjoy it. Starting out always sucks. Do what you can, try out interval training.
As for gaining weight (bulking or whatever you wanna call it) carbs are your friend. Complex carbohydrates such as rice and oats are great. It'll take your body much longer to break them down, therefore energy will be released over a longer period of time, it'll keep your blood sugar levels stable, makes you feel more alert and you won't feel tired right after eating. Try being a bit more consistent with your eating tho. 5 meals a day sounds great if you can spare the time, but you need to spread them out throughout the day.