Hey and welcome!
We are definately a friendly bunch, I have met some very inspirational people here!
Good on you for deciding to lose weight, you will get lots of support here, and dont worry that those other times didnt result in long term weight loss, just learn from the "failures" and keep going, this time will be different!
Your start weight is similar to mine, I am 6 ft as well and started at 125.5 kgs. I am now 101.4, and trust me, If i can get this far, anyone can! Cant wait to get to know you