I want a ballerina body

Just a note: You "cannot" achieve "long, lean" muscles. You either have them or don't. Muscles insertions and shapes are determined by birth. You can't "elongate" a muscle. You can "visually" make it look longer by reducing body fat or losing muscle (through catabolic means) to look more "lanky" (my term). But no program is going to change muscle length or shape unless you're doing one where you're adding muscle.

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Yep this, Stretching/toning routines won't make your have long lean muscles either. If you are a girl and bulky you have either A. eaten too much, or B. used drugs.

Taking up dance classes is a great way to get in that lean body shape! But keep in mind, a lot of proffesional ballet dancers are naturally that thin because they've done it all their life - their muscles are conditioned for it. Dancers that start later on in life or non-proffesionally while of course can be in great shape, tend to be not as slender. (At least in my experience with dancing ballet up until my teens this is what I've seemed to notice). Dancers have a lot of pressure to be thin, and eating disorders are sadly very common. The ideal weight for a professional ballet dancer is about 85lbs at 5' tall and add 5lbs for every inch taller - this is considered underweight on a BMI scale!
By all means though don't let that discourage you, just be mindful of your health :P - dance is one of the most beautiful forms of art, it's a great source for inspiration!!

Unfortunately, to some extent your body type is your body type. I'd love to have slender legs, but I have Mary Lou Retton legs instead. I wear size 6 or 8 bootcut jeans, have 18.5% body fat and need wide calf boots. My daughter has a Jennifer Lopez butt and big boobs but slender legs. You can ditch the fat, but you can't change your basic body type.

That said, if you're not taking steroids lifting won't make you bulky.

^^^ This.

do ballet?

Dancers are very muscular. I had to sit in on some dance classes to write a paper for college and they beat the hell out of themselves with strength exercises. Work on strength, don't take steroids and you will be lean, and not "bulky." You aren't going to look like a man if you lift heavy.

Doing ballet would actually help! I did ballet from when I was 4 and only stopped 3 years ago- it's fun, makes you graceful and flexible... but it is very, very hard work and requires a lot of discipline.

Have you heard about or looked into Tracy Anderson's Metamorphosis program/Method? She has 4 different body types - mine is Hipcentric. I started last year in May and within 2 months had tightened and toned and was beginning to get back my ballet body from way back when. ;-) Even when I was practicing ballet 5-6 days a week for many, many hours, I still had slightly bigger thighs but a super tiny waist, upper body - very, very strong body except upper body. The thing that Tracy's Method has given me is a super strong upper body, lean/sculpted arms, and after a few injuries last year and getting off-track due to Bikram Yoga injuries, I am back on the Tracy wagon and it's all coming back again. She is also a former dancer who never had that perfect "ballerina body" but check her out now. Her stuff works!! You can check out some of her workouts on YouTube but I am a subscriber to her Metamorphosis program - I'm about to start Continuity #2 in a few days! She keeps sending you new workouts and changes it up every 10 days - keeps your muscles guessing but keeps them long, lean, strong, and healthy!! Check it out!!

If you can handle ballet classes (I tried going back a few years ago and my body just can't take it anymore - knees, etc) then do ballet. If you do it at least 3 times a week you will get closer to that look you want. Your body type sounds like mine.....smaller upper body, smaller waist, and then a heavier butt/thigh region. It's doable!!! :-)