A rushed take-off might be the problem here. Steps 2-4 of this trick tip could help you out. In order to make your feet “stick” to the board, you have to do the movement fluidly. But don’t stress yourself out! You should rather start with some preliminary exercises until you feel safe while ollieing. It is also important to pull your foot up to your board’s nose in a straight manner to prevent it from spinning.
Hey, I’m a girl too and I’ve been skateboarding for nearly ten years now. I’m not a pro or anything, but I used to ride around in the local skatepark that was mainly just a big bowl that was fun to just drop into and cruise around in. I’m only just now learning street tricks. Anyways, I’d go there and the dudes would sometimes tease me, but sometimes they’d tease me about it. The thing you gotta do is not give up. Just ignore them. Dudes are stupid. Practice at home, by yourself, and learn some awesome stuff. So when you get really good, you can go to the park and if they start saying bad stuff, show off. It’ll blow them away. It always made me feel really good to show them that I was better than them right after they teased me for it.