I'd gone to shows with my dad and brother - my actual "1st concert" was Sha Na Na at the Circle Star Theater in the SF Bay Area when I was 9 or 10. Went to a few shows at the Greek in Berkeley with pops too, including Elton John in 1979 (I was 9 yrs old - it was an awesome show) and Jefferson Starship in 1981 (at 11).
But for going to a show without adults, my buddy's mom drove us and picked us up from our 1st concert: KISS on the Lick It Up tour. 1983, and they just took off their makeup and lost Peter Criss from drums for Eric Carr and Ace Frehley was out and Vinnie Vincent replaced him. Decent show, but not the best. At 13 though the pyrotechnics were off the charts awesome. Accept (Balls to the Wall) opened for them.
2nd concert was Sammy Hagar on the "I Can't Drive 55" tour a few months later in early 1984, with Zebra opening. This was an awesome show - Sammy did about 5 Montrose songs, and Zebra remains one of the most underrated bands of the era in my opinion. I believe Dream Theater just did a cover of one of their songs (Take My Fingers From Your Hair) and did an excellent job of it. Zebra's 1st album (the one they were touring for) is pretty much an entire album of great songs.
https://www.youtube....h?v=IceGhFW0r8w
3rd was about 3 weeks later, also in 1984. My older brother was dating a girl who's dad owned a tour bus company. For her birthday he gave her a tour bus, tickets and backstage passes for 30 people. I managed to sweet talk her into the last ticket, much to my older brother's chagrin, because now he had to watch after his 14 yr old brother. The bus was stocked with food and 2 kegs of beer, and I got completely housed. Iron Maiden was much more in my wheelhouse than my brother's, and so he tanked it at the last minute (think he caught a flu, but may have been faking) so his g/f and her 10 slutty 17-19 yr old friends basically adopted me as their little metal muppet - I was in headbanger heaven that night. To this day, while I've seen better shows and higher quality shows (Joey Defrancesco, Allman Brothers, Derek Trucks, Trucks/Tedeschi Band, early VH, Metallica with Cliff several times, Faith No More, Black Sabbath with both Dio & Ozzy, Ozzy solo on Bark at the Moon, Rush about a dozen times, PInk Floyd, etc, etc, etc) the whole experience of having a tour bus, beer, hot wimmenz fawning over me all night, and getting to meet Bruce Dickenson and the band was all just such an amazing thing to my 14 yr old pea brain. That was one of the best nights of my life, much less concert experiences.
I still get to about 5-8 concerts a year. Got into my punk roots and saw Dead Kennedys not too long ago (no Jello, but they still rocked) - last year I saw Silversun Pickups, Cake, Testament, Mastodon, Garbage, Jane's Addiction, System of a Down, and about another dozen club shows with local blues or bluegrass bands. The SF Bay Area has a great music scene.
Special Mention to Deep Purple on the Perfect Stranger's Tour.
That was one of the best shows I've seen - it was the year after Ian Gillan left Black Sabbath and it was DP's "reunion" tour, though it was only 2 years removed from their last tour. The album completely rocked and it was kind of special to me because it was the one band from the 70's that I loved that "still had it" - I'd seen several who were not as good as the albums, and thus not a great concert memory, but DP was pretty much still in their prime. Richie Blackmore is a tremendous guitar player, Gillan still had that remarkable voice and John Lord played the best Hammond/Leslie solo I've ever heard to this day. Just ripped that organ to shreds live on stage.
Here's a taste of that show (well, not that show, but from that tour)
https://www.youtube....h?v=gEVMU_waY9c
Keep in mind, when that organ played, you felt it. It shook the audience. It shook the amphatheater. There's nothing quite like it.
Here's a little better quality Jon Lord just to give you an idea of the kind of solos he was busting out:
God that man was ridiculous and I feel blessed to have seen him in his prime.