No matter what u do , nothing gonne happen if your not a teenager. U might get lucky and gain 7-8 pounds lean mass if u haven been training before, rest of the extra weight will just be fat around your waist, depend how old u r.
There is only one thing to do, if u wanne get bigger and more muscular, start using steorids. If u dont, give up your dreams about being muscular.
Maybe you should try another sport where your bodytype is more fitted. Runing, swiming, cycling...
Why u wanne get bigger? For ladies? Or any other reason. Snoop dog is like a stick, and full of self confidence haha, work on your inner stuff, its all in your head.
Try to find other things in life to get a better selfconfidence, job education, poker star...I dont know.
Maybe om all wrong : )