How come? Unless you had a shit time or something, there's no reason to be ashamed of your first concert! If it was why you were into and you had then who cares, you know?
Well id gone because someone bought me a ticket. I was into those bands but it was around the time I started getting into the stuff I'm into now and I remember being there and thinking I just did not belong. Plus i knew next to none of the songs any band played lol. It sounds corny as hell but i always wanted my first concert experience to be life changing and this absolutely wasn't lol