I'm an 18 year old female and I want to learn how to really dance! :D Where do I start!?

Start with 1 class if you can't afford more and as you can afford it, add them in (average cost is between 40-50 a month for a class at a small studio here in NY so it may be around that where you live). That's what I did. I started hip hop classes 3 years ago at 31. So you can start at any age if being a pro isn't important to you and it doesn't seem to be. Look for either teen or adult beginner classes in the style you want to do first, yes ballet is the foundation for most other styles (not hip hop), but you don't HAVE to start it first. I did hip hop and jazz for 2 years before adding lyrical and ballet this year. For some hip hop stuff you can learn moves and combos off youtube as a place to start, for ballet, jazz or tango you would really need to take a class so you know that you are doing everything the way it should be done and get corrections if you aren't. Also don't worry if you get put into a class with girls who are younger than you, my ballet class is a bunch of 11-20 year olds. It's about learning the dance and not who is dancing with you. Of course you really shouldn't be put with kids younger than that cause they can't physically do what an 18 year old can do. As far as getting into the music and dancing with emotion, that will come the more you dance. I hope you find what you are looking for, and have fun.