I love my parents so much it's making me depressed.
That's a double edged sword. How long have you felt like this?
I'm depressed since eternity. I will always be.
It sounds like you put your parents before yourself. You have got to stop wasting all of your energy on others and focus on your own wellbeing every once in a while.
I can't, I love them.
It's admirable that you love your parents that much, but don't you think your health matters a lot too? How about trying to invest into yourself instead of others for a day? You don't know how great you could feel!