OK i just put all my measurments in to www.mybodycomp.com and it says i have 116 pounds of lean body mass. and it also says women should have 23% body fat.

OK so I did some math and if i get to my goal wieght of 140 with 116 pounds of lean massthat sould give me 16% fat. which is to low for women.

but if i get to 150 pounds with 116 pounds of lean mass i will be right about at the 23% fat that they say women should have.

OK here is my querstion should I adjust my goal wight is 140 unrealistic?
I am 5'10 and i ahve tiny bones ( i ware a size 4 1/2 ring and can fit my thumb and pink around my wrist.)

what do you guys think?