Help, seriously, help

Any of you guys sometimes just feel really stupid? I feel really stupid most of the time now. I have trouble saying words, pronouncing almost everything and just thinking quickly on my feet. I don't know what my problem is anymore, but I feel like such a dunce meeting new people cause I can't hardly remember things just said to me 5 minutes previously....It would suck if I have early Alzheimer's....But honestly, I think that is the way I have been feeling. I am pretty sure it is just cause my brain is a muscle that isn't being put to use....

help?!