For everyone saying "find a teacher": what specifically will the teacher will pick up on, that I can't pick up on my own listening voice recordings of myself? The situation is, I've known that I should find a teacher for many years. However, I can be quite stubborn and have instead been recording myself playing guitar/singing for the past several years. With debatable progress. I know I should find a teacher, but wha…
For example, if you try to sing a note on the top of your range you will likely resort to "muscling" the note by adding tension, but this approach if far from optimal, and will limit the amount of range you can add.
This is coming from me as a semi-professional classical vocalist, but I will also admit that my advice is likely much less useful for people interested in the kind of singing common in country or indie/folk music, as these kinds of music require much less technical complexity in their vocal production.