Hello, and Happy Sunday!
It's neither okay or not okay; it's just the way things are when a boy reaches puberty, as you have done. When I was 14, my introduction to sex arrived in the form of a torn-out picture of a nudist colony that I accidentally discovered in the possession of a classmate. The hormones began "roiling," as they say. It's natural that you're curious about sex because your body is evolving. As corny as this may sound, puberty occurs the moment you realize that your penis has another function aside from urinating. If you want to watch porn, watch porn, but don't become obsessed with it because pornography is not real life. However, once this awareness occurs, you have the responsibility to not allow it to get out of hand. Treat girls with respect and don't employ your sexuality as an excuse to treat them like objects.