Is it normal to pull at your hair until some comes out?

In my English class, I've noticed when I'm not paying attention I sort of tug aimlessly at my hair, look at my fingers to see if any have pulled out, and flick my fingers to the ground. Then I started doing that to my eyebrows and eyelashes as well. I found out my brother had the same problem because I found a bunch of hairs lying in the bathroom trash can that looked like they belonged to him. I think it's called trichotillomania, but it's not to the point where I have patchy spots of hair. This just doesn't seem very mentally healthy. Can anyone let me know?