Well I'd also ask what ur bf is too. If ur 7% bf for instance, at that weight and height, ur better off lean mass wise than 90% of the crowd on this forum, lol.
I'm 5'5" @ 170lbs, in a cutting phase of course, and the weight packs a better punch for us smaller guys. 16" arms and 25" legs is fairly easy to come by with 160+ lbs, if ur lean enough...
All that said, eat more carbs. Like 2:1 carbs to protein and get at least 20kcals per lb of body weight. Avoid high fat diets, they dont work on smaller guys like us. Bulk for a max of 8-10 weeks at a time then go into a lower cal maintenance to increase insulin sensitivity again otherwise after 10-15lbs of gains you'll start seeing insulin resistance and higher fat accumulation.