Why is it so hard to make friends as a Adults?

Why is it so hard to make friends as adults?

(I'm 22)

It doesn't help that I live in a small city and it really doesn't help that I live in the Texas of Canada.

Its hard to find ppl who don't have a hateful complex here

but other than that sometimes ill meet somebody at clubs or other places like work and at the end of its always goodbyes and nice to meet you and hope to see again and that's where I'm stuck...so

I just need some good advice on how to ask ppl to be friends without making it awkward

or maybe that's just how it is as a adult  "hey you wanna friends with me" will always be  awkward... or probably its my Anxiety getting in the way haha but any advice. :) 

and if adult feels the same way as me feel free to send a friend request. <3