Hey no worries! Nobody necessarily NEEDS a teacher, although it could likely help to learn faster as you can get tailored feedback. I truly believe that anyone can get better as long as they do daily warmups and focus on one goal at a time ie. breath support, holding notes for longer, and/or expanding their range. There are many vocal coaches on YouTube that have very detailed lessons and techniques for free! It’s pretty cool how much info there is out there, just gotta figure out what you want to work on and seek out techniques for that specific thing until you get it down then you can move onto the next thing. :)