There're a number of theories out there dealing with how people talk to themselves. One of them says that if you say something outloud, it means you've thought it to yourself something like 20,000 times (or some other outrageous number. I'm kind of making that one up). So if you're saying things like "god, I suck" or "I'm so stupid" or "I hate everything" it means you're spending a LOT of your time thinking negatively.
Not sure you're doing this? Simply monitor what you say outloud and you can get a barometer of what's going on inside your head.
I've been working on this for a long time, and have really cut back on the number of horrible, judgemental things I say to myself. (It used to be mostly "Ugh! You're so stupid!" or "Too fat!") Now, for the most part, me, myself and I are just chat buddies, striking up conversations whenever we feel like it. (Generally, not on a crowded subway car or in the supermarket or anything -- we're discreet.)
For the sake of entertainment, I spent a day making mental notes about the outstanding things I say outloud to myself. Here are but a few. (Mind you, these are all things I said outloud, to nobody.):
"Ooh, that does NOT taste right." (and then I drank again.)
"Let's go then, shall we?" (apparently I am the queen)
"She's so awesome!" (as I hung up the phone with a friend)
"Toilet, please flush. I'm getting sick of this." (arguably, I said this to the toilet.)
"Couldn't you just do yourselves?" (again, I was talking to the dishes.)
"It helps to take your keys, Kate, if you want them." (I do use my own name.)
"Ok, we're done here." (I said this as I walked away from a cake.)
"Phew! You are stinky!" (I can't help it. I just went running!)
I'm sure there are more, but these are the ones I remember -- or at least the ones I caught myself saying and then actually remembered when I sat down to write.
My challenge for you, though, is to keep stock of what you say. Are you friendly? Are you harsh? What comes out of your mouth, and what swirls around in your head?