How many people have I offended by studying a master's degree in Australia, being called "water master"?

I have been studying in Melbourne for over a year now, and I know it has cost my parents a lot of effort. I never bragged about it, but I did share it with my friends. However, one day I found out that someone, even my close friend, was talking behind my back, saying that I was wasting my parents' money and that I was just hanging out. I really don't know what I did to offend them. They would talk to me nicely, but then turn around and criticize me. I feel so unjust and hurt. Being in a foreign country for studies, I am not familiar with the surroundings, so I can only share some interesting stories from my life when chatting with friends. But somehow, it turned into a sense of superiority. Later, I went through the chat records of my former classmates and realized that it wasn't just one person I offended. Despite my hard work, I still have to endure people's criticism. No one knows the effort I put in. It's really disheartening. In the end, I wish everyone a successful study abroad journey and urge you not to let others affect your mood. I'm so upset that I can't even sleep. 😭