Stopping high metabolism?

Hello guys I am having a serious problem here, so I am 14 well 15 in August 15th and I am extremely skinny. I think I have high metabolism as I eat a lot! well averagly and I dont freaking get fat! Well I do get fat but in a very very long time, it looks like I am not even getting fat. I mean my brother isnt like this at all he is tall, bulky, and average weighed but me I'm skinny you can see my ribs my shoulder bones and my wrist bones they look really bad. I take vitmans, even sit on the couch all day and do nothing but eat nachos but that still doesnt help I dont get fat! Is there any way to stop high metabolism or reduce it simply? I really dont like this, I am the only person within my friends thats like this. I have a deep voice, I did reach puberty and I am extremely skinny which looks really bad on me, I do have some muscele but it doesnt show as I dont have any meat on my bones! This has been an issue during my whole life. I read lots of articles on how to get fat if you have metabolism issues but none of them helped... please any ideas. I dont want to get extremely fat I just want to have some meat on my bones...... if you try to pull the skin off my ribs nothing will come off you cant pull it off cause all you can feel is my ribs. Also my back bones show asif I am a skeleton they look extremely bad from behind, and my spinal cord the same thing...... any ideas........