you are skinny because you are skinny minded, no matter how many tin weight gainer you take, if you are skinny minded, it gotta be waste

so what to do? gain your basic nutrition knowledge, how our body works..bla bla bla bla

read this, it will give you some basic idea

http://stronglifts.com/how-to-gain-weight-for-skinny-guys/

your goals to be set > gain muscle instead of weight, gaining weight from fat is kind of...erm

and last.. dont expect you can gain good result without excercise. SQUAT FTW