Need some good minor depression advice?

Hi there, after too much thinking about my mom and her boyfriend that brought his negativity into my house And brought it upon everyone else, I've decided to live with it, try to ignore it, rise above it and stay positive. However I'm still kind of bitter about it and get annoyed and down pretty easy because I live with it. Can anyone give me some tips on how I can keep this negativity out of my head? Sorry I didn't explain a whole lot but there's too much to expalin