Feeling guilty about porn

Hi,so l am 13 and l watch porn and l masturbate.I started doing it maybe a bit earlier though.l know a lot of guys my age do it cuz they talk about it at school ( im a girl tho ). I heard a lot of people say that porn is normal but is it normal for a 13 year old? Lately l have been feeling extremely guilty and bad about it.Someone please help!