Yep, I've been like that my whole life. Isolating myself from family, from close friends, because I felt our relationship was meaningless. I thought If they're never going to fully accept me and understand me, then what's the friggin' purpose of this relationship? I always abandoned people in order to find someone better, but it never worked out. There was never someone better than the previous person, it was simply a copy of the previous person.
The isolation is paradoxical because it exists with a need to find that one person, or that small group, where I finally feel at home, connected, authentic
I am 28 now too, and I'm at a point where I have accepted that nobody is ever going to fully understand me or love me unconditionally (this includes family). I understand now that love is conditional, and that my relationships with people will always be temporary, a phase of my life, nothing that will last forever. This has resulted in me living life like this:
Not bothering to be extra social or meet people on purpose. I just live my life, do what I enjoy, travel as much as I can by myself, go here and there, & the people I encounter along the way are simply minor characters in the movie of my life, of which I am the protagonist (we all are the protagonists of our own movie). I never make friends because I simply don't care to know people, because I know it will not lead anywhere except chores (having to buy them stupid birthday gifts, and having to endure their drunkenness at 2am, having to listen to them tell me how my dreams and goals are ridiculous and impossible, etc). I have no time for people, no interest. Therefore, I live in complete isolation. I don't even have a close relationship with anyone in my family because they're always trying to bring be down, so I avoid them.
I don't get lonely often, but it happens every now and then, and it's reeeeally painful. I am of course a dreamer, always will be, and this dreamer wants close connection with at least a couple of humans. I want to trust and be trusted, love and be loved. So yes I get lonely because of these desires. However, I am not going to fuck up my life to accomodate people who don't believe in me. I believe 70% of the population of the world are not worth my time or energy, this sounds harsh, but after 28 years puttign up with crap... I woke up and said "No more BS". My trust in people is broken. So here I am a lone wolf by choice. However, I do keep a faith inside me of finding one person from the 30% one day. The faith is there, but I don't actively seek for people. I believe nobody can make me happy, only I can.
When I'm alone I almost never feel lonely, when I'm with others and I start wanting to share, that's when I start feeling lonely.
I kow that feeling so well

I got tired and decided 'fuck em all'. Not as in 'it's their fault' cause it's nobody's fault. I said that phrase to myself as a statement of 'I don't freaking care about other anymore, I care about me and my own happiness and this happiness is never ever ever going to depend on finding someone to connect with'. My happiness depends on connecting with the Source of life, if you know what I mean, it's something bigger, more all-encompassing. It's a feeling of 'I belong in the world' even when I'm completely alone in the middle of the woods. All I feel is bliss in the middle of the woods with nobody around.