What+If+I+Am+Mentally+Impeded?

(Note: I chose to use "impeded" to dodge any accusations of derogatory use.)

I mean this seriously. What if I have a mental disability, a serious mental disability? What if my mental acuity is simply an illusion, which is furthered by the desire of everyone around me to shelter me from the truth of my disability?

The only real problem is that everyone around me has this certain level of intelligence which is clearly intelligence. Then again, what if my education was so swayed that I was taught to understand everything the wrong way (such as "intelligent" to mean "stupid", and vice versa)?

This is a thought which comes to me from time to time. Sometimes I feel weak and helpless, even totally separate from the rest of the world, disconnected, and see everyone around me either being nice to me or ignoring me, very few mean to me.

This thought brings up another thought: What if the mentally disabled think they are intelligent? Do they know that they aren't? What do they think about in the first place?