Yes, totally normal!
Around 12, 13, 14, etc. you are changing not just physically but hormonally and mentally. You stop being a kid and you start being a teenager. You reach puberty. And your sexual desire rises.
Yes, masturbate! It is better to masturbate than having sex at your age. However you need to make sure that porn is sometimes not the best way to explore your sexuality. Talk with your mom, I believe she is more open than your dad. Ask her to talk to you about sex. And let her know you prefer to learn from her than from your friends.
Oh, and Dan and Jenn posted a new video just today about sex education. Perfect for you!
LIVE - Sex Education - Who's REALLY Responsible?