So for the past month I've been having a great deal of anxiety over something

So for the past month I've been having a great deal of anxiety over something

So for the past month I've been having a great deal of anxiety over something kind of strange. I've always overthought everything in my life, which led me to wondering whether we as human beings are able to control our thinking. Sometime it seems as if random thoughts pop into my head for no reason at all. For example I could just be at work and randomly think of the upcoming superbowl. However, why did I do that? Did I choose to think about that? Or did the subconcious part of my brain send me that thought? Wondering about this kind of frightens me. I know it's irrational to be scared of it, but it makes me think that we don't really have free will. Do we really control our thoughts? Please answer.

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