It's not hard to accept it and move forward from there. You have to start out small, even if you have a good vocabulary that everyone can understand. My little sis was having trouble reading when she was young and it turned out she was dyslexic. A new pair of glasses and a few doctor prescribed drugs later, she graduated from med school.
You just need to challenge yourself and put in the time to do it on your own. Hell, my ex's old man was a copper and couldn't even write out a parking ticket but his partners and his supervisors took care of him because he was a good person. They just enabled him to give up on education instead of trying to help.
We did it in two years and trust me that guy had a ton of pride and balls of steel. He wanted nothing to do with some 20 year old kid giving him english and math lessons, but he did it for his daughter and got there. Sadly he passed way too early at 51 from prostate cancer right here in my house but when the hospice would dope him up he always wrote letters to me and my ex, thanking us for taking him to another point in his life.