You are normal dear. Has much as I don't like to admit it, I too started at a young age. I can't remember when I started masturbation
. For the longest time I didn't know what I was doing. I kept it a secret from everyone for the longest time. Now that I am a lot older I know now that it is normal. So you are not the only one that started at a young age.
P.S I never was abused then or now, so not sure how this all started. Just exploring I guess.