Your sync and timing are GREAT! I really enjoyed watching this. For a first AMV, this is really really great, I think! A lot better than my first, that's for sure! I agree with CrackTheSky, it is a bit short compared to how much it contains. If that makes sense.
Your flow is downright epic, though. I think it could use a few effects, but that's just me. You did an awesome job bringing out the beats, and the emotion stands out well in my opinion. Keep it up!
And don't feel bad about being rejected, get back on that horse and try again! ^^