One thing that I find unusual in your post is that you're very focused on your diet.
To accomplish what you want to accomplish, you're going to have to eat a lot more food. A LOT more food.
Guys who are very serious about bodyuilding and are preparing for a show will weigh their food and will know how many cups of food they are consuming.
Guys who are where you are should not be measuring their food. You should be eating very calorie dense food and should not be focusing on portion control.
The key to everything is a very aggressive weight lifting program. But to get you into a normal height-weight proportion, you're going to have to give some thought about your relationship with food because you're not eating enough to maintain your basic body functions much less to put on muscle mass.