Absolutely normal for your age dear friend It's common anxiety at your age But as a doctor I would suggest you to stay calm and there is no harm Human body is meant to behave in this way So don worry

Watching porn and masturbation are perfectly normal. If you are sexually excited and doing masturbation it's perfectly normal. However if you do it just for the sake of doing it because you have made it a ritual then it's wrong. However masturbation doesn't cause any harm or reduce your penis size or make you week or anything else. It will also not make you sterile or impotent. Chill out my friend.