I didn't want to tell other people because I didn't want them to make fun of me.

make 是动词，意思是"做、制造"，在这里构成短语。 fun 是名词，意思是"乐趣、玩笑"。 of 是介词，表示"关于、属于"。 make fun of 是一个固定短语，意思是"取笑、嘲笑某人"，指通过开玩笑或讽刺的方式让别人难堪。