Who To Gain at Least 5 Pounds FAST!?

I'm SKINNY I think I'm Too Skinny! I guess for my age I shouldn't care. but everyone says I'm real skinny but there all real overweight( im not trying 2 be mean it just there real big). Of course I like my body it just I'm Bony. I'm real TALL. The reason I'm asking is because my friend is weighs more then me and shes real short & kinda fat. SHE TOLD ME "WOW U R SO SKINNY DAMN I CAN C UR COLLAR BONE (i cant seen her collar bone) I said I'm just Skinny. But I want 2 gain 5 pound but how???!