Many women worry that weight training will somehow transform them so they spend hours doing cardio in order to maintain their "feminine" figure. The truth is, women just don't have the hormonal support to gain muscle mass like men. The hormone testosterone is responsible for large increases in muscle mass. Women's testosterone levels are a fraction of men's. That means you can bench press without concerning yourself about how much chest hair you might grow.
There are women, typically professional bodybuilders, who look masculine. It takes many, many years of dedication and a particular lifestyle to achieve this sort of muscularity. Unless you have goals of becoming the next star in female bodybuilding, you don't ever need to worry about looking too masculine.
You're right about one thing, though: training with weights will increase your lean muscle mass. That's a good thing! The more muscle you have, the more calories your body will burn. The more calories you burn, the leaner you'll get. Increased muscle mass will also add shape to your arms, take inches from your tummy, and even add some roundness to your booty! When women's magazines talk about "tone," they're really talking about strong muscles.
