I do it too. I have at times taped little sticky notes with positive sentences about me in places my gaze falls often, like on door frames just at eye level, where I go in and out frequently. They said things like I will have a good day today, I am proud of myself, I am good at cooking eggs, I am a hard worker, etc. I did it because I listened to my thoughts one day and realized that I was mostly saying negative stuff to myself. I was critical and unsupportive about pretty much everything about myself. I resolved to change. The notes were helpful because it was a consistent positive input from an outside source.
I talk to myself out loud in a positive way sometimes too, to psyche myself up for stuff and to handle stress. Hearing the voice is not the same as thinking it. I find it affects my mind differently, even if I am the voice.
We have to become creative problem solvers, not just tolerant burden barers.