I feel very much the same regarding childhood and college, but I feel I came out the other side a different person.
In grade-school, my family moved often. I never had the experience of a friendship longer than about 3 years. Tech appealed to me - I always wanted to know how things worked and since no one took kids seriously, outside of it being a bonding experience with my dad occasionally, it was an activity I did alone, one where I spent large parts of my days learning about and experimenting with whatever I could get my hands on.
College was the first time I was exposed to people who shared a common interest. It wasn't a large campus, and somehow I ended up getting a reputation for being one of the more competent CS students on campus. People would approach me every day in the university's coffee shop to ask for help with class or pick my brain for ideas on hobby projects. I grew to seriously enjoy talking to people about what they're working on. I also grew to enjoy teaching and tutoring people - to the point where I'd give unofficial supplemental lectures in our ACM meetings about things I felt were missed in various classes. Computer graphics was a huge passion of mine at the time and a lot of people hated the class because it did a poor job of bridging theory to practice. I did so, so many OpenGL tutoring sessions.
After college I moved away from everyone I knew to take a job in another part of the state. I didn't really start to understand until then that I now craved socialization. I spent the next few years without anyone to (physically) spend time with. Much of my socialization was my Discord gaming group of everyone from back in college (still all together 6 years later).
After the main part of the pandemic I decided I was tired of being alone. I feel like I spent 6 years of my 20s locked up so I packed my life up and transferred to where all the people I was actually friends with were. Multiple social engagements a week for the past 3 months - I haven't been this happy in years. I even have people to go to the gym with!
I feel like being alone turned me into a more negative and reserved person as opposed to the "can't wait to share the cool things I know and or learned with everyone" person I was in school.
I don't know what to call myself. A shy extrovert? I'm horrible at starting a conversation but wow can I keep one going if someone else initiates.