IPhone 6 won't let me purchase free apps?

It won't let me download any free apps it keeps taking me to sign in for my billing and I've tried to remove my card but when I went to go do it the "none." Option is not available where it says credit or debit or PayPal. How can I get rid of my card so I'll be able to purchase free apps again

Why do I feel guilty after every meal?

I have no idea what is wrong with me, i've been dieting for around a year? I've lost nearly 3 stone (around 40 pounds i thing) but after every meal, healthy or not i feel unbelievably fat and discusting, i feel like i want to stick my fingers down my thoat and throw everything up or excerise for hours! Like today i've had so far
breakfast: chopped up green apple, chopped up banana and natural fat free yogurt
but i felt fine after that.
snack: i had a flapjack because i baked them and i feel Really Really fat and that i shouldnt eat for the rest of the day and i've already been for a 1 mile jog, cardio excerise like jumping jacks and squats, press ups and crunches
i'm going to do a zumba work out soon because i still feel horrible! Sometimes even if i have an apple or veg or fish i feel really fat, what's wrong with me? I'm not going to eat any lunch because i feel disgusting about myself. Also i use an app on my iphone called myfitnesspal.com and it lets you count all your calories and i have a goal of how many calories i should take in 1 day and i've set 800 for me, is that healthy? But i normally only have arounf 450-500 rarely more. I just wish i was like all my friends who can eat candy and cookies and chips and not worry about there weight. Btw i'm 14, 5ft and i weigh around 138 pounds.

IPhone internet service?

First off I'm 61 and dumb about cell & the net. I have an iPhone 6. Right now I'm on a plan with AT&T for 50.00 a month for cell and internet. Kinda hard to afford. No computer. Is there a better deal out there for me and my iPhone 6.