L.W.
D.
My son had it in first grade when he wasn't close friends with any of the boys in his class (his best friends were in another classroom) and didn't know any his classmates very well. Fortunately, he had a phenomenal teacher who picked up on it too and paired him with another boy who was very nice to him. It gave him more confidence. I started making "playdates" with the kids in his class and eventually the familiarity of his classmates made him look more forward to school, and made his feelings of insecurity fade away. It will pass, but I would try to give your son a (very) subtle social nudge by creating opportunities for more classmate interaction. Our district has a great soccer league that many Kindergartners play in. It is a really great way for the kids to interact/have fun and as an added bonus the parents get to know eachother better. Check and see if your district offers a league and definitely take advantage. So a sport, recreational class, playdates,etc. are all events you will be present at (so he feels secure) but will also give him the opportunity to meet/feel comfortable with new friends. School will eventually not feel so intimidating.
Good luck...I know how literally heartbreaking it is...but I promise it will pass. Good luck.