OK, we are pretty much the same with respect to start stats and height. So I understand where you are and how you feel.
ALL I can tell you is three simple guidelines that will get you on your way:
1. Accept the fact that this isn't a DIET, but a new WAY OF LIFE. And that it will take time, but there is no timelimit out there!
2. Research all the plans you like, but FIND one that fits with your lifestyle. And I mean it! IF you love your steak, a vegan lifestyle may not be the best choice. IF you enjoy the occasional treat, you gotta get a plan that lets you work this in. WW, Calorie Counting, whatever. But you gotta find a STRUCTURED plan that will fit with your life.
3. DECIDE that no matter WHAT, you are going to stick to your chosen plan for the next 3 months. Only 12 weeks. As 100% as you possibly can be. Re-evaluate then. I'll bet you'll be so happy you'll wonder what took you so long to take this step and you'll continue on. And the reason I say 3 months is that, well, you can do ANYTHING for just 3 months, no? Sometimes it is easier to make a short-term committment to start with.
And for heaven's sake, stop beating yourself up. Stop the self-loathing! It isn't productive. Put this in perspective -- you haven't KILLED anyone. You haven't been driving while impaired. You haven't been convicted of tax evasion. Your weight is a little high, that's all. SERIOUSLY. It is just a freaking number that shows where you are right now. It isn't permanent. You can change it. You DO have the power to do it! You just gotta decide to get on with it.
So forgive yourself, make a committment to yourself to find a structured plan and stick with it.
This is how pretty much EVERYONE started. It isn't easy, and it won't be quick. But it WILL be worth it...
Kira