My sexuality and coming out

Ok so I'm like 99% sure I'm pan but I've never dated or talked to a girl. I've had a crush on a girl but I don't know if i actually liked her. I'm not sure if I should just hide it or tell people. My best friend knows and so do a couple of other people but i don't know how to come out to my parents. They are very open-minded and wouldn't care if I was. I don't know why I'm so scared to. I need help...