Scared shitless about theatre

Oh fucking hell

I've got a performance of mamma Mia coming up and I am not fucking prepared at all 

It's in a month 

I don't know what to do 

I'm so scared 

I don't feel good enough at all I feel like I'm a shit actor. 

I need something ASAP like I can't fucking do this anymore and this goes towards my grade I can't fuck this up.