Help I think I'm inlove with a friend?!?!

I mean I've been friends with her for almost 4 years and I just get a yearning for her
I have nobody else to ask because I don't want to talk to my friends about this...
Like I have never had a crush but maybe it is a crush??
I'm super confused and I feel like the people on this site are probably some of the best people to ask
I won't ever tell her about these feelings cause she is 100% straight but I still just wanna talk about them
If you need more info just ask