I was like you once. It really helped me to take an extensive Myers-Briggs test. You can find free tests online (be careful because some are very simplified... the most helpful ones take about an hour to complete).
Once I understood my type, I was better able to navigate social situations and identify people who were sympatico. I have two good friends now and consider myself rich as Croesus. Try it.

Myers-Briggs: the equivalent of astrology for the corporate world.

Why not? Anything that works and leads to a happier life for the OP is good, isn't it? If I were lonely, I'd even try a Tupperware party. Could be fun.

How does the op knowing their MBTI help them in friendship development? How does it help them "navigate social situations and identify people who were sympatico"?

I've been there and totally hear you. There's two friends I've known for years. Good guys but they're both married with children and I'm single. It's two completely different lifestyles from each other. I was always the one taking initiative long before they got settled into married life. It got exhausting, which made me feel emotionally detached so I basically left them alone. If they want to drop me a line, they have my number and know where to find me. it's their choice. Other than that, I pretty much moved on.