That's so strange to me. I am not saying I don't believe you, I have just always had the opposite problem. I'm 6'1" and right around 300 lbs at the moment, though, happily, a lot of that is muscle. I have to watch my diet like a hawk to lose weight, which I don't blame on my metabolism. I just eat too damned much, and probably even worse, I tend not to eat the first half of the day and the snack constantly the last half.
It's strange to see the flip side of the coin. I also don't think the grass is greener. I suppose it is new to see how the other half lives, but I also have empathy for not being able to live up to a proper diet in the context of how you wish to look. I have struggled with that since I was in grade school.
Get a watch, turn on the alarm for every 3hours and everytime it beeps it's time to eat!!! So just eat and commit yourself to it, don't get so distracted, this your biggest flaw, me and others gave you all the tools you need, so rise up to our efforts and meet your goals!
And when you go to eat, at first its gonna be hard to get the food down so try not to think about what your doing just concentrate on gettin the food in your mouth