Am I a sex offender?

Am I a sex offender?
When I was a minor under 18 I masturbated a lot. I was always dressed but there were times when I would do it with my sister in the same room and she is younger than me. She never noticed really except for once but she didbt know that’s what I was doing. She never payed attention to what I was doing. I didn’t know it was wrong at the time to do it with others in the room. I’m worried that since I did it with another person in the room I’m a sex offender..

Does that make me a offender?

Justin’s Answer
Probably not. Most of the sex crimes require you to exposure yourself for gratification or to startle others; if you were just an ignorant kid you are most likely safe. If police ever ask you about it, tell them you want to talk to an attorney, then let the attorney sort it out.