That's what I have to tell myself sometimes when I'm not feeling exactly super or fantastic, just to make myself have a more positive attitude towards things. Strangely enough it actually works! Well, at least a little bit. :)
I take a deep breath, tell myself everything will be okay because God is on my side, and remind myself that I AM SUPERFANTASTIC!!
Try it today if something unplesant, annoying, or frustrating happens. ;)