Any tips or advise?

Recently I’ve noticed that feeling sad and depressed is a choice, I’ve heard it many times in inspirational quotes, I’ve told myself that many times, I’ve come to realize it before but this time it’s a different depth…if that makes any sense.

I’ve also notied how my mood is dependent on how a certain person in my life feels or acts like, who happens to be a very toxic person, I’ve noticed my instant reaction to her behavior is depression and or anxiety and it’s become a deep seated pattern.
Thing is I don’t know if I should train myself to stay positive which consists of pushing myself a lot and going through a lot of headaches or let my emotions take their time and heal whenever they’re ready. I know feeling that way is counter productive, I’ve been telling myself that it’s only taking its toll on me ....idk idk I’m just very confused rn

Idk how it sounds like to you but it’s been crippling my life so much that even realizing it fked me up :\