How do i properly do scremo?

I don't know if your a singer already or not, but my advice would be to learn how to sing first, that will give you a better understanding of were your voice and the air is actually coming from, another thing if you are doing it properly, the first few times you do it your belly will hurt a little bit, it will just feel like its been working pretty hard,basically because it has, because that's were you have been getting the air from to do these screams, im a 15 year old girl like you and i am a singer but i taught myself to scream, well actually they were more like growls which were pretty cool too, but if your throat hurts after, you are doing it wrong drink some water take a break and try again, also look up the zen of screaming, its pretty good