Am I exaggerating?

I felt guilty firing my fitness trainer. On my second day of my session she's 15mins late , I did not mind it at first because she's human, human is not perfect. 5days after she texted me if its okay with me to change my days instead of monday to tues she wants it monday to wed since she have a second job( i have 2 session a week) and i said okay. Wed is my busy day but i consider her offer, I just need to find a way. So wed came she did not show up at all i was there for an hour doing cardio and working out my own while waiting. 2hours after she texted me that she called in cause she's sick and forgot to inform me. I was so pissed . I'm okay with her calling in since she's sick i understand that but not informing me makes me feel uncomfortable. I fired her and ask for different trainer but i feel guilty for doing it. .