Help, I am being judged for something beyond my control?

Okay so at school, I am part of the African American Culture Group at my school. I am not black, I am Asian, but I decided to join to learn about black history because I have always found it inspiring. I decided to become an officer, and my job was to create posters. In the group, people tended to single me out for some reason, and also, I have had trouble relating to the group discussions because I come from a totally different culture, and my first language wasn't even English, it was Tagalog - a Filipino dialect. So as the year went by, things at home became terrible. My house was repossessed, my mom had these fits of rage where she threw things and I feel it is because my grandma died, my parents were considering divorce, my dad was deployed for a long time, and my mom's job required her to be at the office from 9-5, so I had to stay at home to watch my sister, unless I needed to stay after school to make up a test. Because of all this, I became unable to fulfill my job as an officer, and I got an Email from the club sponsor. It told me I was very irresponsible, and my lack of apathy was a detriment to the organization. I didn't see this email until after I resigned, and now she and the other officers think I resigned because of that and that I was lazy. I was not trying to make it that way. I was going to explain things, but they are very hostile to me. They don't look at me or say hi to me when I greet them in the hallways, they never look at me when I talk to them, and one instance, I asked how this one girl was doing, she sighed when she looked at me, and said nothing. My friend told me that the sponsor, who is his teacher, told the class a story. She didn't mention my name, but he said she talked about a guy in an organization she sponsored (she sponsors 3 groups, and the other 2 are tutoring groups), and she told them that this person was lazy, and probably an officer just to put it in a college application. She said that he was from a different culture, and probably that is why he was lacking apathy. That is really not true. I even spent 50 dollars out of my own pocket to create a website for them and add extra things to the website such as animations and making it add free. I brought in food every time, we had a meeting, and I made most of the posters that she asked. How do I explain things to them?