I am nearing the half way point of my Senior year in high school and am currently 17. My problem is I look like I am 2-3 years younger than I really am. Although I am almost 6 feet tall my muscles still have not hit puberty stages. I took a good look in the mirror and am abnormally skinny. On top of that I have a really fast metabolism and seems that I cannot gain weight no matter what. As one can imagine the emotional stress this must cause for a pre-college student, it really is unbearable. I went to the beach this past summer and did not swim because the thought of being made fun of. My face still looks like that of a 13 year old yet have a really deep voice. This all seems so strange whats going on, is there something medically wrong with me? I am almost certain it has something to do with my thyroid gland. What do you guys think? I don't think this is something I can bring to attention to my pediatric since my parent is present and don't feel comfortable talking about it with them unless its something more serious.