thought i was straight, now doubting my entire life

Never wanted this, feel very ashamed and embarrassed, but whatever.A while ago I started to really become attracted to men out of nowhere and since it's only become worse. Only think about myself with a guy instead of a woman. Along with my attraction to girls nearly gone somehow, while my attraction to guys only grows more.I really don't want these feelings, but at the same time they won't go away. How the fuck did I get like this?