Why do we feel urges to act on a thought? Where exactly does it come from and how to make it less frequent?

I have the thought of what if I lose control and do something out of my control like scream for no reason or yelling in a store or just blurting stuff out that’s not in my control and it causes so much anxiety and causes me to feel weird. I always think I’m on the edge of losing control of myself and it’s exhausting living like this. Any tips?

OK, this might sound really dumb, but when you guys get intrusive thoughts, do they just come once and then go away? I’ve heard that repeatedly thinking about an intrusive thought is considered ‘checking,’ but it doesn’t feel like I have any control over how many times it comes up in my head. It’s not like I’m trying to check anything—it just keeps showing up, almost like it’s terrorizing me every time. I can’t seem to stop it from looping, stop remembering it, or prevent it from coming up. Every time it does, I feel horrified, and I already know it’s going to horrify me. I don’t think I’m actively trying to see if my feelings have changed, so is this still considered checking? How do other people get an intrusive thought and just move on? Doesn’t it pop up a million times for them too? I always thought that was normal, but now I’m hearing this could be a compulsion, and I feel really confused, scared, and lost. Is this why my OCD feels so extreme? Because I really don’t feel like I can control how many times the thought pops up.

Does confessing an intrusive thought just make it come back stronger?