Hiya Gaia_Girl - Welcome to the forum!!
I hear ya - i'm trying to lose the same amount of weight as well. But you have definatley come to the right place. We can do it!
I have been o/weight most of my life too and from the age of about 13yo, I went to a dietician, then Weight Watchers, Gloria Marshall, back to WW, Jenny Craig, WW, Lite n Easy, WW, Gloria Marshall again, WW a few more times and last year WW again and later last year I tried LA Weight loss. Then before x'mas even thinking about trying the lapband surgery as a last resort. But after reading posts about lap band surgeries and the successes and failures of it, I decided not too. I've finally realised none of them have ever worked before because i wasn't in the right mind set, not enough determination to lose it.
But this year i've found my determination - getting married, honeymooning in Tahiti and America and then wanting kids. Plus I don't want to live the rest of my life so uncomfortable and in pain anymore.
Do you have anything to keep you determined through your weight loss journey?? If not, try and buy a smaller outfit you like in a smaller size shop (i've got a size 14 top and skirt hanging up in my room, which I look at each day, hoping to wear it soon) as that can also help.
Good Luck and look forward in getting to know you and your weight loss journey.