My mother never cares whether my life is happy or not, and tries to satisfy me materially. What should I do if I bother my mother when I encounter troubles?

The distance can be appropriately opened. For example, talk to her about your recent trip or absence to ease this long-term bad mood. When the time is ripe, talk to your mother about your problems in this respect, and then let her learn to eliminate her emotions instead of pouring bitter water on you.