I can’t speak in public unless I drink alcohol. Any good advice?(please no medical)

Hello there.
I can speak normally when talking to myself or with my family. However, when I have to speak in public, such as giving presentations or attending job interviews, I can’t communicate properly unless I drink alcohol.
I’m not sure if this is the right place to ask, but does anyone have any good ideas or alternatives besides alcohol? I’m seriously struggling with this. I don’t use marijuana.
Thanks for reading.