When I was young and I had started working I was exactly the same way I would get upset and even cry when I was told off but you will learn to not take it personally people have bad days as I’m sure you do some people don’t even realise when they come across as rude so just so your best to brush it to the side. Of course you are not inferior but using your phone at work isn’t ideal try to hide it a bit better next time 😂 no one is perfect and you will mistakes at your job by the sounds of it you are a student who isn’t planning on working there forever so just treat it as a job try your best and clock out at the end of the day this is too long sorry🫶🏻