My first job in IT networks, as a NOC Engineer

Hello, it turns out that this is my first job in IT, in a data center in Latin America. I've been here for a little over two months and I would like to know your opinion. I hold the position of NOC Engineer and, in addition to monitoring, we provide technical support in the bunker. We work on the changes at night, receive the equipment, etc. My colleague (in charge of my training) has serious problems expressing himself and structuring ideas; He doesn't like teaching. I can't ask him anything because he gets angry and, literally, if they ask him for last minute changes, he runs out of his house and over here. He has told me not to make plans because they can call us at any time and that it is very frowned upon for me to leave whenever I want, since he interprets it as a lack of commitment. So I do a lot on my own. In the changes he excludes me because he doesn't like to explain, so I stay with whoever it is so I can understand it more or less. The culture is one of 24/7 availability, something that was not mentioned in the interview. Is this normal?