is it normal for teens

I am 15 and I have a group of friends the same age who masturbate and watch porn regularly and talk about it with each other but personally I have never tryed it but I have watched porn but I just have a wired gut feeling also I am too scared that I will do somthing wrong and hurt my self and I have told my friends that I have never done it and they keep telling me to because it good but should i dont know  and is it normal???  help !!!!