this is now the 3rd thread as EZE said you have made in like the past hour.
dude I really feel for you. want to know something though? I once weighed less than you when i was in my late teens. so stop feeling like you need a short cut and feeling bad for yourself. you can do it, but its gonna take time and learning how to eat better.
if you take steroids you could potentially end up worse than before. it might seem like we are all being assholes to you, but trust me thats not the case at all. we really are trying to help you, I just hope you are one of those who stops being stubborn and is willing to change some things you are doing.
this hasn't been mentioned in the other threads either but there is no way you are working out as well as you could. are you really working out your legs hard? a lot of weight is in the legs.. you need a strong trunk to grow branches.