Sorry that it didn't go as you hoped

I agree with gina_re. You might not have gotten rejected. Even though you got a lot of negative feedback, it's possible it was constructive criticism.

Personally, I don't think it's "awful" that you talked too fast. They probably knew you were nervous, and I bet they can give you some leeway on that, especially since your lesson was pretty good.

I also think it's a bit weird that they complained you didn't put students into groups. Don't teachers have different teaching styles? I see the pair/group thing as more of a "teaching style". There are more than 1 way to effectively teach the same material.

Idk. You don't sound like you're an awful teacher. I think your teaching style was different from what they anticipated. (That's what it sounds like to me.) Hell, if you're able to teach a bunch of troublemakers, that's quite impressive. I went to a school with a lot of troublemakers, and most of the teachers couldn't handle them. We ended up learning nothing :|