Affair vs Summer Reading

I already posted this in advice but it’s not very active and I really need help. Three days after school got out my mom left my dad, she was having an affair and now she lives with her girlfriend. It’s been hard but i’m trying to be tough for my dad and little brother. And it seems like i’ve been having a good time this summer since i’ve been constantly doing things. But its just because every time I try to just stop or be alone I think about how hard this really is. And now my problem is i was supposed to read The Great Gatsby and do a dialectal journal for my Honors English Lit class and I haven’t even gotten to the second chapter. I just can’t focus or be in the quiet without getting upset. I go back to school this Thursday and I have no idea what to do. I don’t think I could got my whole dialectical journal done in three days even if I was in a better place. Should I tell my teacher the truth? I just don’t want her to think i’m trying to get out of work and I honestly just don’t want her to pity me.