i have a crush on my bestfriend

I have a crush on my best friend and its been so complicated because im terrified of accidentally weirding her out (you can call her mango for reference) and im not sure im her type, we've been friends for years and me and mango are really close and we talk everyday and we hang out together, I know she's pansexual and I know what her type in men is but I dont know what her type in women is, nor if she even sees me in that way, I dont wanna ruin our friendship because I really value her friendship and she's my absolute best friend, what can I do?