Unfortunately, when you are young you may think you are irrelevant. You are not, and your feelings are maybe stronger than they will ever be. Have faith.
The advice had to do with performativity: that one has to start acting like a writer and living like a writer before one can be a writer. Overemphasis on craft obscures the paramount necessity of message.
If I feel something strongly, I let the sentiment guide my story. When I am lost or stuck, I just remind myself of the initial sentiment. It has never failed me.
Usually, I try to work it into a three-act format, and if possible, I like it to have a pleasant ending, but that doesn’t always happen. Sometimes, the endings almost seem to demand to be written.
If someone—anyone, actually—laughs or cries, that’s all I want from the work. I think the best compliment is when someone says, I’ve never read poetry, but I really like this.