It's okay if you're a middling thinker. Some people are born brilliant or have opportunities and make life decisions to be brilliant that you cannot sacrifice to make. Just try to learn from those wiser than you and say the truth the best you can. And don't fall into jealousy.
While at the same time, strive for wisdom always. Don't let your middling thinking hinder you from growth. Keep working at it. Find your skill and cultivate it and accept that it is not the same skillset of someone more academic or intelligent than you.
Also, when you think you deserve to be read and published, remember that there are much greater thinkers and writers than you who have no audience. And when you feel like you are too inadequate to publish anything, remember all the absolute fools with massive readerships.
Writing is a very dysfunctional meritocracy.
These are ideas I keep reminding myself.