Feeling Trapped in My Own Head

I keep going in circles in my mind, replaying the same negative thoughts over and over. It’s like my brain is stuck on a loop telling me I’m worthless, and I can’t find the off switch. Distractions help for a few minutes, but as soon as I’m still, the cycle starts again. It makes me feel like I can’t escape myself. Does anyone else feel trapped like this, and how do you cope when your own thoughts won’t give you peace?