Is it normal for a girl to masturbate this way?

I'm a girl and I masturbate occasionally when I feel the need. But I no longer use my fingers nor do I use any toys or anything (not that I have any of those) but instead I do something that I don't hear of many girls doing:
I will get a blanket or a shirt, and roll one of the sleeves into a "penis" shape, and then lie down and ride it on my bed till I cum. I always have my clothes on when I do this rather than being naked. But I've never heard of any girls doing it this way. So my question is, is is it normal? Have any of you done it like this?