Newbie

So I'm new to myfitnesspal, but not new to dieting, unfortunately. I need to lose a ton of weight, more than I ever thought I would, and I'm looking for anyone who has done this the "natural" way. At over 300 lbs, I don't know of anyone who has lost weight and not had surgery doing so. I was diagnosed with diabetes last yr, and although it's under control, I worry about the complications that come with it. I have a very strong family history of diabetes, my aunt is dying of kidney problems, on dialysis, my dad has heart problems, and my cousin died from complications with foot infections/amputations, and not healing properly from diabetes. I have 4 kids, one with special needs, and I want to see them grow up. I know if I stay this weight, I am taking years off of my life. Thanks in advance for any support/advice!!