How to tell what my voice is?

How can I tell if I'm an alto, soprano, bass, alto bass, mezzo,etc. I sing songs by Christina Aguilera, Paramore, Lady Gaga (just examples) best. My voice is that pitch. What would that be classified as? Also, what are some good vocal exercises? Also, how do I tell what notes I'm singing? Like c, g, etc lol. I have no idea about notes.