I have a problem with one particular word even tho i know i can say it

I have a problem with one particular word even tho i know i can say it My girlfriend lives in a gated community, so the security guard asks me her address everytime i visit her Her address starts with P, and i know i can say the word, im saying it right now as i write this, however everytime the guard asks me i stutter, i have to tell him first before he asks me because if he asks me and i have to respond i stutter this is frustrating me a lot, i dont understand why i feel under so much pressure in that situation, ive visited her house hundreds of times and i keep struggling how can i relax? how can i get over it?