> I studied onsite at 2 universities and have 0 contacts/friends from there.

IIRC, it's harder than high school to make friends at a university. It's bigger and more anonymous, and outside of student housing there's less free time where students are forced together.

My high school class wasn't too much larger than Dunbar's number (300), and you were getting mixed up with the same kids for 6 hours straight for 6 years.

My university wasn't even that large, and I think there were ~>3,000 kids in my year and plenty enough in my major that it wasn't uncommon (without deliberate effort) to have zero overlap from semester to semester.

You're not going to make friends by studying. Hard pill to swallow, but you have to make an effort to talk to people and get to know them. Go out to lunch with them.

If you're eating alone at your desk, you are signaling that you wish to be left alone.

That's a really strong signal you are either being too picky or focused on yourself. This isn't necessarily "bad", just an observation. Sometimes the environments you put yourself in lack the spark.