I know exactly how you feel. I am 39 years old, 5ft 3in tall, and back in January I weighed in at 267 pounds. And I know I've gained more since then! I have been overweight my entire life. Although no where near as overweight as I am now. But thankfully, I will have my surgery on the 12th of June, and am very excited! Like you, I have tried every diet under the sun, and could kick myself for not doing better several years ago when I had the chance. Now I can't lose weight to save my life. I joke with everyone about how my fat loves me to much to leave. But inside, it's not a joke to me. I am very self-concious about my weight, and have even gotten to the point where I don't want to leave the house, and probably wouldn't if I didn't have to work.
I wish you the very best with your weightloss journey, and congratulate you on your upcoming wedding.