That's normal. Masturbation is a great way to relieve stress. If it works, keep doing it. It doesn't hurt anyone.
Is it normal to have been horny at around age 6? I'm a girl by the way...I remember when I was young I would have this weird but good feeling with certain things. I remember having masturbated by sticking the bathtub hose in my vagina. It felt great I did it everyday, until my mom caught me. Thinking back now I'm embarrassed I hope she doesn't remember. lol. But ever since then I haven't stopped using my hand much...but is that normal? at age 6??
Absolutely. You found a simple way to induce pleasure. Did you associate the feeling to anything sexual? Probably not. At young ages, masturbation is simply a pleasurable act that for most is not connected to anything sexual. You'll find that a majority of people experienced the same thing. When you got older and realized that sex involved the same parts of your body, then you connected masturbation to sex. If your mother hadn't caught you, would you have felt that it was dirty or something to be ashamed of? Of course not. You'd have just continued doing it and thought it was perfectly normal.
I say keep masturbating. In fact do it more often. It is a healthy way to relieve stress and its a lot of fun.