I did, when about 14 - a combination of worrying I was doing it "too much" and a lack of privacy on a holiday. (One of the worst decisions of my life: I'll never get those orgasms back.)
Thanks to a sex ed teacher with a clue, it wasn't long before I read Kinsey who, once again for the slow readers, showed definitively that there is no physical harm associated with masturbation, but that almost everyone worries they're doing it "too much". It also shows there's the usual curved distribution when it comes to frequency: any attempt to draw a line and say 'that's side is ok, but that's wrong' is arbitrary and value-laden.
Have a read of Ethical Porn for Dicks. I found a copy after this started and it addresses the sex panic very nicely.