Eager to gain weight

Lately I have been much disappointed by a fact that I can't find myself suitable pants. I am just too skinny.
While most girls complain about their being overweight or are dying to lose some weight, I unfortunately and ironically try my best to gain some weight so that I can have more choices when I shop for clothes.
Since spring is coming, we all have a good excuse to buy more dresses, but I just can not. Most pants make me look even skinnier, which drives me crazy.
I have made up my mind again to start my body-building excercises. Hopefully, I can persist for a longer time this time.
Just for the sake of beauty, I will do my best.