I hate when people say something is a bad idea and don't explain why and what we can do better or change to it to fix it...that's being productive! Haha
So here is the deal. Your diet does need work. And for you to lose weight you do need to find out how many calories your burning during inactivity, and you need to find out the amount of calories you take in during a day. After you do this, you need to find some way to decrease the amount of calories you are taking in. A lot of people will tell you to cut carbs, or cut fats blah blah blah. Bottom line is to lose weight you need to intake a smaller amount of calories per day than your body is currently taking in. So, after you factor in all of that, make your diet healthier. Basics are you really cant eat too many vegetables, don't eat TONS of fruit, but you can eat fruit, try to eat a lot of chicken, (the breast seems to be the best,) and look up when you should be eating carbs and how many. Your body burns carbs as an energy source when you exercise, but you need to learn when is best for YOUR body to take them in relation to your workouts. (Sounds complicated but do the research and you will find out.) Then figure out a work out that will benefit you. If you want a nice summer cut look, then a lot of body weight exercises or light weight exercise. (A lot of pull ups, push ups, body weight squats, or do the weights in the 13 to 15 rep range.) I like an APP called GAIN fitness, I think it does a good job with a generalized workout plan and it gives you a lot of good movements. I know this post is long, so here it is: Eat less calories per day. Pick an amount that allows you to lose weight, calculate how much food you need to eat to get there, and plan ahead. Stay away from processed foods as much as you can, no sugar, soda, beer, candy etc. Make sure when you calculate the number of calories that you need to be taking in by the end of the day, you also calculated how many calories you will be burning from exercise. I suggest you go to a local gym and maybe get a trainer, they can help with this stuff and make sure that you have proper form, and also help you with diet and the like. They will do a lot of the planning for you and guide you through the learning stages and hopefully teach you enough that you will be able to do it all on your own. Hope that helps you out a little. And don't worry too much, you ARE 16 and its really hard to change your body at that age. I weighed 130 pounds until I turned 21 and then I turned into a man and now I weigh 210 with very low body fat. Your body is developing. And to be honest at your age I don't recommend a ton of weight lifting, Just run a lot and do push ups, sit ups, pull ups, squats (body weight,) and try to perform different variations of those.