This could have been something that I wrote 10 years ago. The worst part was that I had no idea how to tell anyone what was wrong, because "I'm afraid I'm going to kill myself" just sounded so bizarre and unrelatable. I was so convinced that one day it would happen that I stopped making plans more than a few weeks in advance, because it legitimately felt like I wasn't going to be alive by that time.
This was before I learned exactly what intrusive thoughts are, how they work, and how there's no need to fear them.
The reason we find it so difficult to allow these intrusive thoughts to be there is because we get so caught up about what they MEAN. We think that there must be SOME reason they are there, and that they are important. Almost like we're living a lie, and the thoughts are the reality; a ticking time bomb that will eventually make us do the thing we're so afraid of.
But that's where we have it all wrong. That's not how thoughts work.
Thoughts are literally nothing more than the brain trying to make sense of the world, and the feelings we're experiencing. They are mere suggestions (and rather inaccurate ones) about what is important, and what is currently happening, based countless conditions. How we were raised, the environment we live in, genes, hormones, our physical health, and everything in between, all play a role in what sort of thoughts flow through the stream of consciousness.
The role of thought is NOT to make us do things. We do not perform actions because a thought told us to do so. We perform actions based on how we FEEL. Thoughts are only there to try to interpret those feelings as a cohesive narrative. This isn't just me guessing, this is something that is backed by real neuroscience and psychological studies, and is one of the foundational teachings of eastern philosophies such as Buddhism.
Thousands and thousands of thoughts will come and go every day, and for the most part they are unnoticed. It's the frightening ones that tend to stick around because we pay so much attention to them. Thoughts become intrusive when you try to get rid of them, because all you're really doing is labeling those thoughts as "important," resulting in them occurring more often. This is demonstrated by Daniel Wegner's theory of the Ironic Process.
So the goal isn't to get rid of the thoughts, nor is it to analyze their meaning. The goal is to let them come and go. Even if they carry some anxiety or icky feelings with them, those feelings will also come and go. Over time, even the most frightening thoughts will lose their "important" label, and they will occur much less often, and result in much less anxiety.
Remember that feelings are worth investigating and listening to. Thoughts are only suggestions.