The idea that working out will make you bulky is a myth that is especially prevalent among the females I know.
Note that people who want to bulk up often have a very difficult time achieving their goals. It takes years of dedicated lifting, supplements, and a crazy high protein diet. So when somebody expresses concern over looking bulky, it sounds a little crazy, almost arrogant, to experienced lifters. A good answer is: don't worry, that'll be the least of your concerns, especially since leaning out is easier than bulking up (muscle tissue is biologically expensive, and your body doesn't just pack it on without a fight).
A common mistake among females is to attempt to avoid bulking up by doing high-rep 'toning' workouts rather than lifting heavier weights at lower reps. This is the opposite of what you should do. Low-weight high-rep workouts produce the big water-filled muscles that you notice on the beach. Whereas high-weight low-rep workouts geared toward strength produce smaller, denser, and more functional results.
Regarding crossfit, some xfit girls look thick and masculine, while others maintain their feminine figures with ease. This is clear from a quick scan of xfit youtube videos. The difference is only partly due to genes. Those thick, muscular girls have been working on their olympic lifts for years. They aren't just doing the WOD three times a week.
If your squat gets insane, here is a preview of what you will look like... in like 5 years :)