K.C.
Hi E.,
I don't have kids your age, I just wanted to offer you some encouragement.
Whoever is judging you because you want your son to socialize and grow as a human being need their to have their heads examined. I am a mother of three and my older kids went to preschool at different times (what was right for each of them). My baby (18 mos) NEEDED social interaction, she is a very energetic kid and she is SO, SO, SO much happier to go be with friends and have some fun without me for two hours a day. Whatever is right for you and your kids is right for you and your kids and honestly isn't any one else's business.
I hope you find what you are looking for. If you are still interested in preschool, especially for the coming fall, let me know. I have a couple of recommendations for you to check out.
Take care,
K.