Maybe heading down a self-destructive path(maybe an eating disorder about to happen)..how do you stop it?

Here is my story and I need help before things will get worse.I have never been skinny when young,my pictures tell hthe truth,when I was in 4th grade I was not chubby but not skinny either.I moved to the US from Romania and saw all these pretty girls who were cheerleaders,I was in 5th grade,and wanted to be like them yet focused more on school.In 6th grade I entered a beauty pageant and won somehow yet afterwards I know I started to lose some weight.I was average in Jr. High,I loved food and sweets are my weakness especially chocolate or nachos or fries with cheese.In High School I was skinny because of marching band which I did for 4 years,I weighed at 125 (5'5").When I graduated and attended a Jr.College I lost weight like crazy for some reason and my prom dress was almost falling off me so I lost almost 10 lbs. in a couple of months.I took this kinesiology cl which in my opinion made me think that I have to be a certain size to be happy and so forth.I met my bf at the community college and literally thought that I had to be a size 2 which I still am for almost 4 years.My weight between those 4 years was between 115.5-120.My bf and I transferred to a university in 2006 and even there I was working out which is good but I started to eat little portions when it came to my meals.Then a couple of semesters after since I was working out more I needed more food so I would eat more.As of now the scale says that I am 124.6 lbs.,I fit in a size 1 and 2 jeans and my sister,brother as well as bf think that there is something mentally wrong with me.I mean I always say that I want to eat healthier,I talk so much about fat,carbs,etc. that I think that I am taking all the fun away from everything especially when it comes to life overall.A couple of times for instance I bored my dad and bf to death while I was talking about how bad the caloric intake of whatever we were eating was and my dad finally said that if I started another lecture on diets he would get up and walk away.I mean I sort of got it getting out of control persay.Not even a semester later meaning this past semester(Fall 2009) my eating habit was starting to be a bit haywire:I would eat when I would go out but I could never allow myself to eat a full meal so I would always have to have a take out box with me which worried my boyfriend.I started to work out,eat more carbs,cut down on protein for some reason,eat 2%cheese and so forth but finally my bf had it and one day while having lunch he said "Are you becoming anorexic?"That is when it hit me sort of.I thought that he wanted me to eat but he saw that I was becoming sick,had no energy,was doing poor academically in school since I could not function and he felt as though he could not do anything.So then I started to lose concentration in school,if I ate more than I should I would get mad at myself and what I viewed as "more" as in the qty. of food intake was actually less by everybody else's standard.My 14 year old brother weighs around 130-135 lbs and no he is not obese but he has a lot of muscle from swimming.My sister and brother are trying to tell me that there is something wrong with the way I view myself when I am a size 2, yet I am still unhappy about my body or how I see fat where there is none.They are literally comparing me to Nicole Richie before she looked healthier like after her kids and to looking like a 14 year old even though I am 25.When I look in the mirror I see a person who weighs 140 lbs. not 120 or less,I see every imperfection such as fat around the stomach and the then I focus on that and obsess.My siblings just want me to be happy and same with my bf.I used to be happy 4 years ago before I took that cl(kinesiology) because afterwards I was never the same person.I chose to become who I am today but at the same time I feel that if I keep this game up then I will literally get sick.I have enough to deal with which is school and my epilepsy(I am seizure free for 11 months now) so the last thing I want to worry is food,body image and so forth.I somehow come to grips that I need help and that I have really really low self esteem because of the way I put myself down or how I perceive myself.I also need to figure out why when I look in the mirror I see someone who is not there and why things are so distorted.I would greatly appreciate it if anyone could help.