Im worried about my p90x progress?

Im 14..about 6'0 184 pounds and I started p90x about 2 weeks ago...I love the workouts but I just feel im doing horrible with eating...my parents say im doing awesome with eating but I dont think I am...i mean....i know for a fact it has improved..and every time i eat junk food i feel amazingly guilty..(so thts why I try 3000% of the time not to) and i know thts a good thing...i feel like i should be eating salads everyday for lunch instead of lunch food..which is bad..I really dont have a planned diet..i just try to eat my best...Will this totally throw me off??...I feel like ive wasted two weeks...when I started I was about 185-190....Im def starting a diet plan this week..because i just finished my second week...In the morning I eat..these cocoa cheerios in a small bowl with skim milk with either water or orange juice...then for lunch im gonna have a salad with a low fat dressing..when i get home ill prob have some fruit or vegetables...and its extremely hard for dinner...because whenever we eat i feel like im doing bad...because its not fully healthy...and we dont have a whole lot of healthy dinners so...idk about tht....and i cant have anyy of tht like fancy stuff like sword fish orr like some sorta other food a crap load of people recommend....well anyway...im actually pretty dissapointed in myself...its been really hard because we have been having partys every weekend and stuff like tht..but now everytthing is settling down soo im praying ill be ok for now on.