It takes so much energy

It takes so much energy I have to give a presentation in some hours and even though it's only 5 minutes it takes so much energy. Trying to calm myself down, trying to relativize my thoughts, trying not t freak out and denying that I am scared and vulnerable. I don't want to stutter but it will happen, and beating myself up for it will only make it worse. I'm trying so hard to just keep myself together but inside I'm not okay. I hate it.