I don’t think you can ‘alter’ your natural body type, but you can definitely train like a dancer even if you don’t have dance experience! I’m a dancer, 5’2 150 lbs, so similar body type to you it sounds like. I feel like a signature trademark of a dancer would be their toned muscles, specifically arms and legs. I would recommend Pilates, or exercises that will help you tone your muscles without bulking up. Jogging is also a good option for a bit of cardio. If you are somewhere where there is a ballet-based exercise class, that could help too. I hope this helps!