Smokey, don't expect to hear a ton of support or people telling you what you want to hear. Listen to me first, I hear and feel exactly what you are saying. When i graduated high school I was 125lbs and sounded just like you do right now. The truth is that your body will not just struggle with growing new muscle by taking anything, but it will most certainly refuse to keep anything you do gain if your diet is not there to support it. I hear you when you say you eat a bunch and everything like that... i use to say the same thing. Chances are that is not true. Try this first, spend some time looking at the diet forms and other resources about muscle nutrition. Then log everything you eat for a week, EVERYTHING !!! and compare it to what you need to grow. if you are eating as much as you say then you need to eat more.
Think of it this way, skeletal muscle is highly metabolic. Meaning it requires a lot of chemical energy all the time. Now why would your body want to add and keep more of this if you are not giving it the energy it needs already??? the answer is it WONT. Don't mess with the hormones in you system right now. you will only hurt yourself. Try using a diet and exercise for three months. If you don't put on at least five pounds then look at your diet again. Sorry this is not what you wanted to hear but you need to educate yourself more first because you will end up hurting yourself.