I talk to myself.

For around 2 years, more or less, I've been finding myself standing in front of a mirror, talking to myself about whatever's on my mind. Now, when I do this, I never actually speak out loud. I just mouth the words or whisper them, but not loud enough that anyone else would hear it. (But that doesn't matter, because I never do it around other people) I just go on these rants for around 20 minutes, or until something/someone else distracts me from it. But what's really concerning me, is that I tend to talk as if I were speaking to other people. I sit down and do a fake review of a product or something I got that day. Or while playing a computer game, I'll run an ongoing conversation with fake subscribers, pretending I'm filming a video or something. The longest one of these sessions was around an hour. They're getting more frequent and I'm worried for my mental health, if this is a bad thing. Are these the first steps to going insane, or is this just my way of expressing my desire for attention and wishing I could be somewhat internet famous?