That is so incredibly normal, yet I know it doesn't help the outcome much. I'm in your shoes, so I get it. One thing I keep telling myself is that I have knowledge now, to help my son, that no one had for us when we were little to help us along. My son is 10 now and an incredibly happy little guy. He hasn't had it easy all of the time, but shockingly, most of the awful things he's been through were at the hands of adults, not his peers.
In the end though, he's doing really, really, well and I attribute that to me knowing what makes him tick and being able to break things down for him, and prepare him with knowledge and a safe outlet to be himself. It makes a world of a difference when you know what you're up against, and you know how his brain works.
Hang in there. You'll do well by him. 