You can write what you do not know or experience. I've never been in love, but I can tell the story of what I imagine falling to feel like. Writing is not always your own trauma and expertise - sometimes a writer's job is to give power to the people who cannot speak. Limiting a person's work to only the known ruining the what if tells and unfortunate desires. I can write for days about the heartbreak i experience when I was 14 and you would never know it was a lie but I bet my words would still water up your eyes. You can write about what you do not know because maybe it'll give you the courage to take the stuff out and learn.