When I first started I dident really think I could do it either but I just told myself that I would keep going no matter what and I would make changes to my life that I could live with so I would not be so overwhelmed I would quit. Even when I gained weight or had a bad weekend of eating or thought I would never lose another pound I kept going and told myself even if I dident lose a single pound I was healthier for making the changes I was making.
I did lose pounds though and got healthier. I made changes I could live with. I am not on a diet, I changed my life. I eat bread and pasta (but changed to whole wheat and follow the portion size on the box) I buy single servings of low fat ice cream, pudding, chips and crackers (but only eat them every now and then, not every day). I feed myself every few hours so I dont get hungrey and have found new ways to cook.
The biggest peice of advice I can give to you is to not think of this as a diet. I have been on many diets and failed every time. I have only ever once adopted a new lifestyle and here I am 70 pounds lighter and have not failed yet... and dont plan to. You need to find a way to eat where you dont feel deprived and you have your favorite foods occasionaly. (like I go out with my husband every once in a while and split a high calorie meal.... or I went out on my birthday and go a slice of cheese cake and a gyro because they are my favorites,.... once in a while is not going to hurt your efforts and its something you can live with)
Another thing is getting in the habit of exercise. when I started I just did 20 minutes a day of light exercise. I could have done more but I would have burnt myself out. I did that for a month or so and got in the habit and then after that It wasent such a chore to make myself anymore, its just something that I do every day now. try not to think of it so much before you do it, you will talk yourself out of it.
I hope some of this helped you. Put your mind to it and dont quit and you will be able to do this.
I understand what it's like to not have too much support at home. My hubby is a little chubby but is also VERY lazy and doesn't want to do too much to change it, unless I do it for him (like diet and stuff).. My "best friend" is 115 wet and my other sister (as my best friend is also my oldest sister) doesn't worry about her weight and (probably) doesn't think others should either. My mom is a BIG complainer; willing to complain about her weight but NOT willing to do anything about it. I think my main support is/are... my dogs! LOL They are always up for walks when I want to take them and they help keep me going during the walk..
If you need someone to help support you, w/anything, let me know!