Alex,
Obviously you need some direction. Here is what I would recomend. This is a weight training routine that is designed to put on muscle, muscle all over the body and not in any one particular part. This is what you want, and what you need, even though you dont know it.
Here is the program
Monday
Squat 3 sets of 5
Bench press, 3 sets of 5
Barbell Row, 3 sets of 10
Wednesday
Front squat, 3 sets of 3
Military press, 3 sets of 5
Chinups, 3 sets to failure
Friday
Squat, 3 sets of 5
Bench press, 3 sets of 5
Deadlift, 1 set of 5
Now, all sets listed are work sets, and all sets for a particular exercise are of the same weight. Warmups are not listed. Let me give you an example.
Say your bench press is 200lbs for 5 reps max. you might do the bar for 10, 95lbs for 5, 135lbs for 5, 155lbs for 2, then 170lbs for 1…. then, 190lbs for 3 sets of 5.
On each exercise, start your work sets at a point about 10% below what you probably could do if you really pushed it. Then, add 5lbs to your work sets every time you do a certain exercise. Obviously for chinups, just increase the reps. When all 3 sets are above 10 reps, start to hang extra weight around your waist.
Now to Cardio. Sprinting is your friend. 2-3 times per week you need to go somewhere that you can sprint, and do, well, sprints. Somewhere between 40 and 100 yards, you decide. somewhere between 5 and 10 to start, you decide. Sprint, then slowly walk back, catch your breath, then do it again. Gradually build up how many you do.
Now diet. I am betting that you know about how many calories you are eating. I might be wrong. But, decide right now that you are going to get a notepad, and write down 10 vegatables that you can eat, and the ways you can cook them, or hall eat them raw. write it down. Now sit and look at the list, and realize that this is going to be the backbone of your diet. Dont be afraid to include things that are cooked in butter or olive oil.
Each meal should be defined by the veggie dish, beccause this, for most people, is the hardest. Now add some lean meat to this, and you have a meal. Have a little variety here, different meats, different ways of cooking, etc. Dont be afraid of a good ribeye.
Almost no one doesnt cheat on a diet plan, but at your age, it doesnt matter. If you can make 9 out of 10 meals based around meat and veggies, your doing fine.
I would suggest going to some of the recipe and cooking sites online, and getting ideas. I know this has helped me a lot in finding healthy ways to cook and not get bored.
And last, yeah, eat some fruit. I have always favored fruit for snacks, but thats just me.
PS… dont be afraid of carbs. They are not yoeur enemy. But if you want to lean out, meals should not be based around them.
Of course, all this is only my opinion, but still, although it is only my opinion, if you are able to follow it, you will gain muscle, get the look around the shoulders you want, and lost fat. You are lucky, at your age, accomplishing both these things at the same time is still possible.