What should I do about this depression?

At first I thought it was the house I live in triggering it, but today I realized for the first time that it's actually my mother that is making depressed, anxious, tired, etc (more of her just being around me). What should I do about this? It's hard to deal with considering it's just me and her and moving out isn't an option as I am still in high-school. Also, it's not that she's doing it on purpose, perhaps it's just a subconscious reaction i'm not sure.. but i'm finding it hard to enjoy doing anything when she's here and have a much better time when she isn't.