Dear Hobojohnson ~
Maybe you are like me, I was sociable enough at school and uni, but found most relationships simply did not inspire me enough to make a sustained effort. True I had a couple of close freinds at times, but changing schools a lot fixed that.
Later on in my occupation, which brought together a very close-knit group lead to friendships, but they were based on a feeling of 'them or us'.
I suppose the only two people I've really felt that closeness to and would do anything for are my two partners. There I've not even thought of being close, it is just there.
Everyone is different, some are naturally gregarious with tons of acquaintances. Some need compatible interests and depth and with luck find a few to class as true friends. You can't really go looking for them, it just happens.
As I've gotten older friendships have formed more easily, particularly as I get to understand people better, but basically I expect depth that is not often there.
Patience, there is nothing wrong with you.