Why Do I Keep Wetting Myself?

I’m an 18 y/o female, and for the last month and a half or so, I’ve been having recurrent accidents. When I have to go, it’s very sudden and very urgent without any warning, and I have to sprint to a restroom. Depending on how full my bladder is, it also burns badly at the very end. Lately I’ve consistently found myself not being able to hold it in anymore right as I’m going to undo my pants, and I keep wetting myself. I did a urine test for a UTI and it came back negative. I also got tested for STDs, also all negative. I was already extremely depressed but this has made it so much worse. I never want to leave my house anymore. I just want it to stop. What’s wrong with me?