I'm 24 next month. (#### that sucks to write)
Yeah I'm pretty skinny. Luckily I'm only 5'10 so I don't look too ridiculous. I'm really hoping that filling out starts soon cause that would be great

I did kind of jump in weight and definition a few years ago but it wasn't much. I'm still way to skinny for my (and most peoples) liking. Fun part is no one feels guilty about calling out someone for being too skinny.
I also need to up my athletic activity again. It's really dropped off in the last couple years. Problem is I only really like team sports and don't really know anyone to play with outside of the occasional season of ball hockey (which I blow at). My friends that are athletic are also all pretty good at the sports they enjoy so playing them in like Tennis and Squash is pretty lame as they just school me.
I haven't done any tests for my stomach. It's usually pretty decent when I eat normally. Only tend to get stomach aches when I eat something that I know will probably give me one later anyways and usually after a good flush I feel fine again. You want to see bathroom explosions you should see what happens when I drink the recommended serving of Mass Gainer protein. It's almost immediate as well. It's like the 4th of july of violent sh*t... That was quickly discontinued from my regimen.