Is it normal to have imagined conversations with myself

I always imagine conversations. They always go perfectly in my head. But in reality, I usually never end up saying what I wanted to.

I don't know how in depth you get with your conversations but I normally just rethink conversations that I had that day. Mine is simply because I overanalyze and try to think about if what I said was the most appropriate or interesting thing to say. Also when I get into arguments or something I tend to do the thing where I think of awesome comebacks like 5 hours later. Haha so as long as no other strange voices are telling you to go do violent things I'm pretty sure its ok.

Yes.. I believe we do this to ourselves to mentally prepare ourselves for possible future scenarios so you are better prepared as to what you will say/react... I am sure there is more than one reason but I imagine this is one of the main reasons people do this. Its ok!

I usually have future imaginary conversations of what I would say in a certain situation.

I think it's normal because it seems like you're just letting your imagination take wing, which is perfectly fine as long as you aren't overly indulged in it.

Sometimes I imagine talking to my friends too, especially when I am very mad at them but I don't want to storm at them (because that would hurt our friendship). Therefore I would imagine storming at them and blaming them in my mind until I feel better. I would usually talk to them after I'm sure I can talk rationally.

If your imagination is really strong and creative, I'm thinking that maybe you should not waste it. You may want to write your one-sided conversation down as letters or record them. They may turn into something brilliant or simply something fun to read :D