Trying??

I've read several places that for example if you say "I'm not stupid" your subconscious hears "I'm stupid." Assuming that's true then I helped my family teach me that I'm stupid. They told me things I already knew as if I wasn't smart enough to know them & I replied with "I know. I'm not that stupid." After a few years of that (Or maybe a year. I don't remember.) I quit saying it cause I no longer believed it.
Thinking that maybe I can try to use that now. When something happens or something that makes me feel stupid or shows that I'm stupid (at least in my eyes) I think I'm going to try to say "I'm not that smart" instead of "I'm stupid." I won't feel like I'm lying like if I were to say "I'm smart" & may learn to see myself has being at least a little smart. Won't make anything any worse then it already is anyways & I don't like being the stupid worthless one. Want to have a brain (aka some intellegence) & feel like I matter.
I'm open to any comments anyone may have. Just try to be nice please. I hurt enough already.