It is not stupid to fall short on a first attempt. What would really be stupid would be if you never tried to expand your abilities. Therefore, Hobo my lad, you have AVOIDED stupidity by this bold effort you made. Now, you must not feel put down when I tell you that what you wrote is an okay poem (and I'm truly complimented by the idea it expresses), but it is not strictly a sonnet.
Past generations were accustomed to more exact forms in writing--perhaps because there were fewer people who COULD write, so that the literate class was small enough to be more easily influenced by style-setters. A true sonnet MUST have fourteen lines, with ten syllables in each line; the only exception is that occasionally an extra syllable is tacked onto the end of some lines to allow a certain choice of rhyming words.
I am now going to ADD enough words to your existing words to MAKE your poem into a sonnet, not removing any of your original words if I can help it, even drawing on your commenting text a little. This will wind up as, I think, the first COLLABORATIVE sonnet on the Sonnets thread! All of the words in the end product should still be thought of as YOU speaking to me.
He's forty years my senior, so I guess
It's natural he knows a little more;
Old Copperfox may smile as I confess
He's helped me understand more than before.
He's careful, thoughtful, and he's most well-read,
Upon each story's thread he will reply.
He's always kind, with a well leveled head,
And won't let any good idea die.
To me, a simple teenage Southern boy,
He's kept consistently a patient mind,
No matter if my thinking's odd, or coy,
To me, he's not annoyed, but always kind.
Somehow he puts up with me as I am;
So, Fox, I do appreciate ya, man!