If my muscles don't hurt after exercise, does that mean they won't gro!

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Yes, it does. However, a well trained muscle will have to be worked very hard and very long before it will become sore and even then the soreness will be mild compared to the early training of untrained muscle. I've been working out for 40 years and I can still make my muscles sore if I want to work them hard enough. However, I'm maintaining and not trying to grow so I don't feel much soreness.

You should be having some soreness in your muscles if you're working them to failure. High intensity training is essential to making muscle continue to grow or hypertrophy. Cardio boxing and lifting with high reps is not how you make muscle grow. You do that through heavy weight and low reps.

Watch Scooby's videos and you'll learn how to exercise for muscular hypertrophy. You can find him on YouTube at http://www.youtube.com/user/scooby1961 . Don't be intimidated by his size of goofy personality. He's smarter than he looks and everything he has to say applies to females as well as males.

Also, be careful not to over-train. Allow at least two days rest between workouts for each muscle group to give the muscles time to grow. More time will be necessary as the muscles become increasingly trained. Over-training is the most common mistake newbie bodybuilders make.

Good luck and good health!!

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The soreness you feel the day after exercising is delayed onset muscle sorness:
http://en.wikipedia.org/wiki/Delayed_ons…
This usually only occurs when you first start working out a muscle group, and after a few weeks you stop feeling it. It doesn't mean you won't build muscle, it just means your muscle are used to be used for exercise, so don't worry about it.