Junk food addiction

I have a dilhema. I am 5"7 and weight 143 lbs. May not seem a huge problem I know but I have tremedous self esteem issues about my weight. I have become agoraphobic and haven't left my house in 4 months, not even into my garden to get the washing in. I just feel that if I leave the house people will think I'm disgustingly fat. It seems ridiculos but I can't switch these feelings off like a tap. I am ghostly pale, have iscolated myself from my friends and family and the only thing I have left in my life is food. I don't eat extremely unhealthily. By some standards my diet would seem wholesome (salmon and salad, fruit) I don't like chips, pizzas, burgers or anything like that. It's the sweet stuff like chocolate and biscuits. I could devour a whole packet of chocolate digestives in one go.
I desperately want to lose weight to get my confidence back. However, every time I start to eat healthily I get these huge cravings for the bad stuff. I feel that without these foods I have nothing.
I've been contemplating of doing a Water Fast to overcome my junk food addiction. However, when I start to prepare for my fast by eating raw foods or simply cutting out the junk I trip up because of my carvings. I feel that If I din't eat, I wouldn't think about food as much. So..... would it be ok for me to just go straight into a Water Fast (mabye 4 - 5 days)without any preperation? I can't live like this anymore. My life is like Groundhog Day. I feel guilty living with my parents but not being able to pay rent because I'm too scared to go outsde and get a job. I'm 19. This isn't a life, it's just a bloody existance.
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