Hi Josie & welcome aboard
I too have tried to do the weight loss thing on my own before...tried and failed.
Although it's only early days yet for me this time feels different...one of the reasons is the support and encouragement you can find in this forum...it is a great thing to have behind you as you tackle the weight loss mountain.
One of the hard things about doing it on your own is feeling that you are the only one to experience the things you experience...the only one to have cravings, the only one to feel like crap and turn to food for comfort and then feel like you've blown it and can't succeed, the only one to be in a constant battle with food etc. Knowing that there are other people who have experienced or are experiencing the exact same things is really comforting. Knowing they won't judge you but will offer you the benefit of their experiences and/or a helpful hint to get you back on the weight loss train is even more comforting.
I have a long way to go with my weight loss (I'd say close to 80kgs) but I feel that this time I'm going to be successful due, in part, to having so many people willing to help me along the way.
I hope you get as much out of the forums as I have. We're all here to help each other and the more the merrier