Am I normal?

I think about sex so much. Don't know if this is normal for a girl.  I'm 21 a virgin and I'm horny a lot! I watch porn online even when I'm home from school and my family is sleeping in the other room. I feel so guilty about it. I can't help it though. Sometimes I do it just because I'm bored and I can get a little obsessed. I like to just watch girls pleasure themselves and do what they do. Then I always feel guilty and dirty after masturbating. Anyone else feel that way? I’d love to know