Figuring Out The Issue

Okay, okay, okay. I figured out what is wrong with me, I think. I've been wondering what is holding me back from taking initiative, and I used to blame my past for that. I thought about it a lot last night, and I realized it's not my past it's like my brain. I have this tendency to believe the worst things in life will happen to me. So, I realized that the things stopping me from taking initiative are that I believe these terrible things will spawn from this one event. I need to break those thoughts. I know there's like methods of replacing negatives with positives, and some might even say fake it till you make it. I don't know if that is really a way to do things. You guys have any suggestions? I know I need to break this habit because now I'm having extreme anxiety and panic, and I feel like I'm going to explode if I don't fix this.