Can I set up icloud on my iphone without losing all my stuff?

I have an iphone but never set it up with itunes or icloud. If i do that now will it reset to factory settings? Will i lose my music, apps, photos, contacts, etc?

Yes.basically, when you buy a song or take a picture it saves your stuff on internal "phone" storage. When you set up icloud it makes a copy of all your stuff and stores it on a cloud so you have your stuff on your phone and a server somewhere so you can access both ways. No need to worry