Victim of Sextortion and dont know what to do

Hi, I’m 18 years old and recently started talking to a girl I met on a dating app called "Wink." We had been messaging for some time when she asked if we could continue the conversation on Instagram. I agreed, and we kept talking, but eventually, the conversation turned sexual. She pressured me into sending explicit pictures, which I did. Although my face wasn’t fully visible, it’s still relatively easy to identify me from the photos.

After that, she revealed her true intentions: she threatened to send the photos to everyone in my Instagram contacts, including my family, friends, and cousins, unless I sent her $1,500. I was scared and explained that I didn’t have that kind of money, as I work part-time to pay for college. She lowered the amount to $400, which was all the money I had at the time.

I tried to explain that my money was on a Greenlight card that couldn’t work with Cash App, but she still insisted. She made me go to Walmart the next morning, miss school, and buy an Apple gift card for $400, which I sent her. She claimed she deleted the photos, but I’m not sure that’s true. Now, she’s demanding $250 every month for the foreseeable future.

I’m feeling extremely scared, and I don’t know what to do. The thought of these pictures being shared with my family and friends is terrifying, and if they get out I will kill myself. I haven’t told my parents yet because I don’t know how to handle it or how they might react, but I’m afraid for my safety and mental health.