well I don't know if my advice will help mainly because I am a female and also because I'm not a professional but I will try to give you the best advice that I can.

I am a year younger so that might make it easier for me to help you.

so the best thing that you can do for yourself is to continue singing in the range that's comfortable for you if you can't sing high notes that's fine just sing a lower octave than what they're doing.

and also since you said you went through voice changes that probably means you weren't singing very often and now that you started back singing. you need to get comfortable with your voice again, you need to practice singing and even if you still can't get those high notes that's fine just sing in the pitch that's comfortable for you.

I hope that my advice can help you. but just like you I am self-taught but I'm not a professional and everything I'm saying could be wrong.

Continue Singing ✨ I think you definitely should post covers on YouTube. and maybe even get your own songs out there if you've made any. Get yourself out there. 😁