I too feel thae same way,and only remember a short term actually feeling 100% myself,i just could not figure out how to explain to my parents that i felt out of place,probably because of the fear of how they would react.
I simply just went along with it thinkinking maybe it's just how one is supposed to feel as they grow older,i don't really regret keeping it to myself,now that i look back.
Who knows they might have thought i had mental problems and drugged me up,leaving me with no hope,and prbably in a mental institution.
Everything happens for a reason,reasons many never get a chance to find out.
I am grateful to be where i am today,as poor as my health may be,as if i weren't i would probably be in a mental ward somewhere,or may have committed suicide,and noone would ever known what my situation was.
My message to those is as bad as you think you may be doing someone is doing alot worse and would give just about anything to be in our shoes.