are you basically just upset that you don't get to eat whatever you want anymore? in other words, you're sad you can't have the chips you love or that you can't go out with friends because of how you are choosing to eat. is that it? because if that is the case, there is a ton of space between fast food all of the time and clean eating. and while you don't need to give up you do need to give yourself some more wiggle room. being too strict is one of the reasons why most people fail. changing your whole diet at once [from fast food to clean counts] is the dietary equivalent of deciding that you are only going to walk around backwards, that you're going to hop over every crack you cross, pirouette every time you cross a threshhold, only take left hand turns when you are driving, and take seven hops every thirteenth minute. how long do you think you could last doing that?
everything that you do on a regular basis is pretty much a habit. your made fast food into your habits and it's can take a while to remake those habits. it can take six weeks to change a single habit. so when you change them all, you tend to fall off the wagon pretty quickly.
so identify what you miss. if it is mac and cheese, make some mac and cheese. broccoli, cauliflower, spinach, spaghetti squash, zucchini and yellow squash all go well in the box mix or your favorite recipe. and if you're having half a cup of pasta with half a cup of veg, that seriously limits the calorie damage it can cause. if you tweak a homemade recipe just try using a little less oil and a little more veg. if you are sad because you can't go out with friends invite them in to your place. you could do themes, play games, watch movies and have fun with your friends.
remember, too, that only being at 60% of where you'd like to be is great progress for two weeks. rome was not built in a day and if you were one of the people who could do those sorts of turns on dimes then you wouldn't be asking this question. you're in the company of around 99% of the population on that.
-google first. ask questions later.