1) Yup, it's mostly because of your hormones. Your hormones get your sex drive going (which basically means you're more horny), and this is the cause of starting to masturbate every day, or watching a lot of porn, or dreams about sex - like this.
2) Yup, like said above
It's a sign of puberty - just as much as getting more aggressive or getting the urge to fight during your teen years (because of your hormones, again, and that's happening to me right now)
(P.S., remember that you're not allowed to share stories about sex or masturbation on the forums, and preferably not through PM either. The reason is that it might attract the wrong type of people, like pedophiles)