Hmm.
I think the concept of these overly deep intense reciprocated friendships is a little bit artificial to be honest?
Maybe your expectations are high, but it is hard to actually meet trustworthy people. How are you meeting these "friends"?
I used to be fairly open to making new friends, but this process can definitely be "diminishing returns" as an adult.
We don't all live in a Sex and the City style life (or have the bandwidth for that kind of friendship!).
I'd say many functional people have their partner, kids, maybe parents...and some situational friendships through work or whatever practical life situation they are in (mums groups etc)?
Assuming you're not super-successful/sociable lifestyle or have a big social group naturally following on from uni or career.
And people don't see you as "high status" or super-extroverted or a group organiser.
Then unfortunately, the kind of person drawn to spending lots of 1-1 time with you as an adult may be weird or a user or predatory. They'll want a therapist or some favour from you.
(I say that as often I feel in the same situation myself
As an older woman who is "doing Ok but not really well-connected", I find most people aren't actually interested in investing 1-1 time with me unless they "want something" or don't have my best interests at heart.
When I've moved to new city, meeting dates is easy and fine....Ok platonic friends who just want a reasonable 1-1 interaction is a LOT harder.
Normal mainstream people aren't THAT interested in and don't value a single woman - unless I'm offering some favour - so me being genuinely open to new people puts me in a vulnerable position).
Also, if you had difficulties growing up maybe you're looking for some kind of perfect social life or affectionate friend or partner as an adult to "sooth" this feeling and sadness.
(And again, predators sense vulnerability).
But actually I'd say looking for ways to self-soothe, work on yourself may be better.
People can be great on an "ad-hoc" basis, but maybe aiming for some deeper interaction is where the problem is.