I need help coming out

Okay so I’m 15 and pansexual. I’ve been thinking about this for a while now and it’s really weighing on my shoulders. I really want to come out to my parents and get it off my chest but I don’t know how my parents will take it. I’ve had a few conversations with my mum before about lgbt and she seemed okay but she also seemed to want to change the topic very quickly. A year and a bit ago I tried to tell my mum that I like boys and girls and she told me it was just hormones. I’m kind of worried that they won’t take it very well or that they won’t understand what pansexual is.

Any advice on how to work up the confidence to work out to my parents and how to actually come out ?