I've been having some diet difficulties and need serious help!!

I'm a 15 year old girl who currently weighs 175 lbs and I'm about 5'6. I seriously need to lose about 20-40 lbs!! Its horrible because it's Summer where I am and my whole vacation is like a whole wash because one, I'm not the weight that I want to be/want to look like, and two, I can't even enjoy my summer eating all the sweets and foods that I want. I haven't even been to the beach yet ONCE because of my weight, nor have I boughten a bathing suit(it would be so hard anyways to even find one in my size, and if I were to buy one I'd want a bikini and I can't because I have a FAT ass, BIG busted, and HUGE stomach, it looks like I'm six months pregnant.. Even my mom said so!!! It's so embarassing, you don't even know. So here's the problem, I have issues with procrastinating. I would say for about maybe (5??) weeks now, maybe a little less or a little more, I've been putting myself on a exercise and diet regimen. There's this app on my Ipod that i've been using, and it's super helpful because you set up a calorie goal for the whole day(my calorie limit intake for the day is 1200) and when you add the foods that you eat for each meal of the day(Breakfast, Lunch, Dinner, and snacks) it subtracts the amount of calories from the 1200, and it will tell you the amount left(like the net). There's also an exercise part, basically the same thing. They have all exercises, from strength to cardiovascular(or you can create your own which is how all those exercises listed came there because people created them. You type in the minutes you did of the exercise, and then it adds more calories to your daily thing cuz' burning calories would obviously mean you can get more food, so your number increases. I try to stay under 1200 though anyways. Someday I will have 400/300/200 calories left that I didn't eat. Because when you complete the diary, it gives you the weight youwill be in like five weeks I think, if you continue to do so with the same calorie in take as that day. And it does that for every day, as long as you hit the button "complete diary entry". P.s, if you were wondering what the app is called... "My Fitness Pal". So as for exercise, I've been cleaning my house(vacuuming etc.,) and jump roping and lifting weights and that type of stuff. But lately I haven't been that consistent as for lifting weights, I've been feeling unmotivated in that exercise and lazyy. I started jump roping for like 5 mins a day, over time increased to 10, then 15, and 20, and now I just recently started 40. I have been trying for the past week/week 1/2, to get up early so I can do the 20 mins of jump roping in the morning, and the other 20 in the afternoon or evening. Depends on how bad the pain is... And what I'm talking about which is another dreadful story, I get aching, sharp pains from time to time from jump roping. I have no clue why, my mom said it might be because I'm puting my weight on them. It's possible. It's basically my shins down to my feet. I started wearing sneakers, it helps a little be, but not so much. Oh and I do it in my basement, there are those carpet mats down, but underneath it is all cement. I'm just very self-conscious and can't do it outside, plus I play music in my basment while doing it, so it makes it a lil bit better. I have my Ipod on a stopwatch, it times each minute, I take a small break in between too. Usually I just write down 1 tall for the 1 minute on a piece of paper, and then hit the start watch and start up again, but sometimes the sharp pains in my shins is too much, that I have to sit for a while. Sometimes it's so bad I have to be done for the whole day. Okay now, for eating... I've been eating Special K cereals for breakfast, but I can only eat so much of it in the morning to maintain the limit on my calorie intake at a reasonable number. I'm always so hungry in the morning, I could eat literally 5 cups of the cereal I bet. But lately I've been sticking to 2 cups. I just switched to Raisin Bran cereal, hoping that it'd be less calories that Special K, and it turns out it's not. It's closer to 400 calories(oh and with the cup 1/ of milk included, cuz y'know, it IS cereal). But once again it sucks, because I can't even what the friggen hell I want! For lunch, I've been making turkey sandwhiches. I used to eat P&J sandwhiches, Chicken patties, tuna fish, that kind of stuff but it got annoying, so I switched to Turkey. I have wonder bread, usually 1 tsp of mayonaisse, 2 slices of the buffalo style turkey breast, and a lil mustard, not even much. Then I will have water bottles throughout the day which I just realized, I've been a little bit laxy-dazy on meaning I haven't been drinking all that much. I will have snacks too; a dannon yogurt, granola bar, apples. Sometimes for dinner I will have Strawberries, Blueberries, and Bananas in a bowl with a scoop(accidently sometimes more) of chocolate chip ice cream. Mostly I will eat my parents food that they make for dinner. Lately though, i've been having INSANE difficulties. For ex, I took a break on the fourth of july, ate a reasonable amount of food I guess, but then I came home that night late, and ate SO much! I ate so many granola bara, ice cream sandwhiches, and just blah. I had CRAZY BAD cravings last night, for some smoothies, cakes, icies, chocolate, candy, pies, you name it. I snuck downstairs and grabbed a box of peanut butter coated/dark chocolate and nut nature valley granola bars and ate all (6?) of them. Then at like 11 when my parents were in bed, I got a big bowl of mixed flavors ice cream. Yep, and I feel so damn guilty!! I give in to cravings way to easily but they drive me insane. Originally when I weighed myself, the lightest weight I ever was so far actually was 171.something. I took the chance to weigh myself this afternoon, 175. Suprisingly there's more I could add, but I'm going to just leave this as is, and if you guys have questions I'll give you more info. But please, help me!!