Is it just me?

This may be weird to ask, but I wanted to know how many people actually masturbate when someone is around? Like discretely do it. One time I was in the car with my mom and my sister, and they were sitting in front while I was in the back. I was wearing earphones and I started watching some sexy videos and got turned on so I started rubbing myself until the feeling went away. A lot of times this has happened but I don't know if its weird or bad for me to be doing it. I don't really have the opportunity to have sex or anything since I'm still young obv, and my boyfriend isnt very intimate, so am I Okay?