Is it normal that i get off by humping soft objects?

I'm a girl , and ever since i was younger, for the longest time, i have humped blankets or towels and gotten off. I put a corner of the blanket or towel, whatever i am using, in my pants so there's a fairly large lump, then lay down and move around so i get an orgasm. i've heard of people doing this with like, stuffed animals when they were younger, but i am now 19, almost 20 and i still do it and it feels so damn good. what the hell? is this weird?