^^^^this. at your current status, you need to eat and lift. and i dont mean just pig out to get calories in that type of bulking, but eat heavier, sure you will put on some weight but you appear to have a high metab so cutting down shouldnt be too hard if you needed to reverse engineer it .
You're not even done growing naturally. EAT, THEN EAT SOME MORE. and then whenever you thin you are full and couldn't eat any more for the day, EAT AGAIN! At your age, you are a growing machine. As long as you are lifting like @CFM likes his men, HEAVY & HARD, You'll grow. You look like the type that'll have more trouble bulking than leaning out. Trust thus community, they've seen it all and guided many body types into some competitive physiques