Quoting Chianna Rose.:" Meet Aizaea, the love of my life. He started learning things at a very young age, he started walking ... [snip!] ... i get so jealous when hes around other kids and they know so much more than him! I dont want him to feel left out! "
I think it is you that doesnt want to feel left out, honestly. :/
Don't force anything on him, the more you do, the more it won't be fun for him.
Try each week having a letter, number, shape, and color to introduce.
Here is a great site for crafts and ideas that I use with my preschool aged girl.
Be creative, messy, fun, and short. They have VERY short attention spans. If he gets frustrated, take a breather and try again later or try something else.
Throughout the day, point things out. If he is playing with a red car, tell him how you love his RED car. Point out how those wheels are circles.
Get cookie cutter ABCs from Michaels and play dough and let him cut out the ABCs with them.
Just don't worry about it. He sounds very smart and there is no need for a pissing contest with other children.