Some questions about Invisalign?

I really want Invisalign. I am 14 years old. My teeth arent horrible. Theyre actually great! But the four front teeth on top are very crooked/: And they make me sad. Im considering Invisalign because I would not like braces one bit! Either way, I need to fix my teeth, whether its Invisalign or braces (Ewww..). But I know Invisalign is soooo much more money, which my insurance will cover. But I mean..is it worth it? And retainers? After Invisalign, how long do you have to wear retainers?? Does it depend on your teeth, orrrr? If someone could help me, thatd be great !!! Thank you(: