What to do? I feel so helpless?

I have an eating disorder and I am trying hard to get it under control. I want to eat healthy and stop eating junk so often. I think its okay to treat yourself on special occasions and such, but not every day. My problem is I go to the grocery store with my mom and pick out vegetables, fresh fruit, and lean cut low fat meats like chicken and turkey, but she continues to buy chocolate chip cookies, vanilla ice cream, peanut er, and sometimes little debbie snacks. These are for my brother and stepdad mostly, and my mom. I come to the kitchen and these things constantly tempt me. Its easy access to grab a cookie or spoonful of icecream or peanut er. I find its harder to resist sugary foods. I love sugar, im probably addicted. I never binge on fruit or vegetables even though i'd like to over sweets anyday because at least i'd not gain weight. I dont even want to binge. I want to eat normal. I know its the sugar. How can i stop reaching for sweets when i crave sweets? Its useless for her to hide them because i either find them or eventually get my own. I feel like i'm doomed. How can I start enjoying blander food with no sugar? Should I deny myself junk food for good because it seems anytime i have just one cookie or anything i cant stop until i am stuffed. Its all or nothing for me. I've tried a few bites but it never is enough...it makes me feel deprived. I hate enjoying junk food. I want to hate it. After all its nothing but sugar, trans fat, sodium filled, high carb, addicting stuff. I don't smoke, do drugs, or drink...thats easy...this is a drug to me...i want to quit. I think it even gives me a high. Like all the serotin the carbs give my body. What other foods have that affect that are healthy? I am depressed and i ume thats why i reach for these foods. I need a lift in mood. Besides exercise, , and depression meds, how can my body make seratonin?