Anybody feel like a "secondary" friend?

i have a lot of friends. but i don't feel like i have one true best friend. kind of like i'm a fall back friend. like if something doesn't work out with their best friend, one of my friends will call me and be like, you wanna hang out soon? and then if i do hang out with one of my friends, i feel like the one thing on their mind is "i wish lindsey were here instead. or lexie. or amanda. or allison. or spencer." i'm just wondering if anyone else feels like they're in the same boat? or some advice about it.