I admit I can not spell

I can’t spell.  However there are people all around me who can spell.  I always end up feeling like such  a dunce when I learn a new spelling after I know I have typed it for the whole world to see, and not a single person has corrected me.   It really does some damage to the self-esteem.  Now I am not talking about the difference between their, there, and they’re or here and hear.  Those I understand, I do admit that sometimes (often) I can’t remember if a work has “ie” or “ei” or any double letters.  I do not know why I have such a hard time with spelling rules like that, but I do.  And I wish people would point out when I have some letters mixed up, or missing, or extra.  This does not go for commas, I like to use them.  Please help, and please be gentle about it.  Thanks.