I keep every single one of my concert tickets and pin them to the wall beside me!
(the only one I don't have is my Megadeth/heaven and hell ticket from when I took a roadtrip to montreal, but I have the admittance bracelet instead)
According to my wall, my very first concert, which I remember fairly well, was Nickelback on Febuary 28th, 2004. I would have been 13 at the time (born in 90, but birthday is in August). It was around the time when I first started REALLY getting into music, and I didn't care who would be there, I just wanted to excercise my musicality
Little did I know that I would be additcted to concerts, and I have been to many since! Though every concert after that one has been about 10 times more metal! But the bands (it was Three days grace and the trews) who opened were nice and tight, and I got to see Chad Kruger get his shirt lit on fire by a pyro. It was wonderfully awesome