I'm dating a woman but I think I like men/like them more

I'm currently dating a woman long-distance. She lives in Poland. I thought I liked her romantically, but I think I just liked having a friend who cares about me. I view her as more like a sister and at this point, she's part of our family. However, I don't think I like women or at least definitely prefer men, and I want a man to go out with. How do I politely break up with her after all this? Is it worth it?