I am not exactly sure what your situation there is, Liliann. It sounds like your food is provided by the place you live in --- is that right? There are probably still a couple of things you can control:
1. Drink lots of water.
2. Watch how much you eat of everything --- you know, smaller portion sizes.
3. Eat breakfast everyday --- things like oatmeal are pretty good weight-loss wise.
4. If a fruit or vegetable is provided, eat it before the high-fat stuff.
Also, I would talk to someone (doctor? floor nurse? not sure) and just ask them what they might be able to do to help you out. Since lots of people have diabetes, they might provide a different set of meals for them and that would be better for you losing weight. They might be willing to work with you some on providing more choices --- or they might just say no, too! LOL But it doesn't hurt to ask.
Another you can do which really helps me is to keep track of everything I eat (the good and the bad) everyday. Web sites like
http://www.thedailyplate.com/ or
http://www.sparkpeople.com/ let you record what you eat and then they calculate how many calories and protein etc. you have eaten; they also can calculate how many calories you should be eating for your height and weight to lose or maintain, etc. They might take you a little while to figure out how to use, but they do help and they are free!
You have already done so well, that we need to find a way to keep you going! Don't give up, Lilann --- you deserve to be the healthiest you possible!