You're not going to become muscle bound just by toning up a little. I know someone who works out regularly, and he's in no way "muscular", just nicely toned.
Also as for being big bones, another friend of mine is 6 foot 6 inches. He's also actually quite big and wide apparently(according to everyone else), but because he's proportional, he doesn't register with me as being exceptionally big, except that I know that I have to crane my neck upwards to look at him, probably because of the aspie in me.
Funnily enough, his son, who is only 6'3", but only a growing skinny 15 year old, does register as tall, probably because he is skinny, and is not in proportion like his dad.
But anyhow, if you're asking why you're feeling depressed and not losing weight the way you should theoretically be, then that's what I'm trying to answer. I'm also sorry that you're feeling so very down, and just want you to know that across the ether, even though I'm just some pixels on the screen to you, I feel for you and wish good things for you.