Help!

I am 16 and I don’t really know how to masturbate. I have tried rubbing my clit and it gets really sensitive and I start shaking and can’t really do anymore. Same thing with the shower head. I’ve also tried fingering myself but that never works. I used to watch porn but I’m too scared that someone will see it in my history or something so I don’t do it anymore. I’ve also tried jumping a pillow but that doesn’t do much either. Does anybody have any ideas for me?? Thank you so much!!