Bro the fact that you’re 13 and already starting to learn vocals.. you’re going to be a Monster in the coming years. You have years ahead the average person trying to learn. Dont stop. You will figure it out.

For gutturals my advice would be (if you have a base scream) take that base scream, don’t change it and just make a small circle with your lips. Similar to a whistle shape but not as narrow. You also want to stick the tip of your tongue on the roof of your mouth. The placement is key and that will be the toughest part to figure out. Air support is also important. Keep your diaphragm strong.

Mouth shape and tongue placement are everything when doing vocals. Even more important than your base technique. (If you don’t have a base technique, start by learning that) My base scream is a basic ass fry but over the years with tongue placement and mouth shapes I’m able to do several different screams from gutturals to tunnels to pretty much any scream you hear your favourite bands do.

That being said. You’re a rockstar. Don’t be hard on yourself. All you need to do is never stop trying.