Cheddar, don't let what others say bring you down.
I'm an adult and I still reference the Dictionary from time to time. Sometimes if I am making a long post, I'll copy it into Word.Doc and make sure that what I am saying makes sense. I love to use commas and always fear I'll write run on sentences.
Those who care enough will try to read into what you really mean.
Like Bubbles said, just re-read your post, before you send it