I just got fired

I got fired today from my role as a hotel receptionist in my work study programme after 40 days of work, the manager told me that I'm si slow and can't keep with the fast pace of the hotel. I feel extremely disheartened, especially since I haven't maintained a lasting job and I'm almost 29 years old.. the experience was rather challenging, there was such a huge mental overload that I couldn't keep up with!