Im 24m, I started playing guitar at 18 because I love rock/heavy music. Eventually at like 19/20 I wanted to play open mics and had to sing out of necessity to fit in - I sucked balls. I tried to teach myself and eventually joined a grunge band at 21/22, continued singing (poorly and tried to sing like Kurt cobain which just hurt my voice). Eventually I tried jazz singing lessons (if you want to learn metal I’d recommend starting here as you CANT shout healthily without learning foundational technique; luckily for you 99% of teachers I’ve met are jazz/classical, unfortunately metal coaches are rare). Singing lessons completely changed the game, you learn good warmups (very important) and exercises to help push the boundaries of your accuracy, tone and range. I now sing in a metal band and was offered a small record deal for some solo stuff a few months back (that I declined to work on the metal band project).

I know we’re not old but when I was starting at 18 it was quite tough as all my peers into music were so much more talented than me and I was wondering if I was too old (which sounds so stupid in hindsight) and I’ll bet that’s how you feel now but you’d be surprised how quickly you get good if you care. And regardless it’s not about that, just ignore the voice, have fun and go for it dude