Maybe there is a certain promoter or whoever who throws shows that you want to get in with? I used to work for a promoter who had a few youngins on the staff and as long she gave them their wristband/whatever, they would be allowed to play/be at the shows. We even had someone who was a resident & 17. He knew he couldn’t go to most shows, but he played the ones he wanted to go to.
So maybe you just need to start online through friends by doing online sets & mixtapes? I’ve heard a few big name artists started their own podcast and got noticed that way as well.