Op, relax, we are all a bit awkward, nervous and wierd! Especially having been without social contact for so long.
Seriously, the truly awkward and wierd usually don't have the insight to recognise this about themselves, so you are ok
You just haven't found your tribe yet!
I remember an elderly nun telling us at school that you only get out of life what you put in, and I think, speaking very, very, generally, that this tends to be true. That doesn't mean that people don't become isolated for reasons beyond their control, but if you have good health, it is always possible to make a bit of an effort.
You have to take a few risks and put the work in, change things up a bit. I moved abroad a while back, and when I felt lonely and couldn't find a club I was interested in, I put an ad in an expat magazine, and started my own. It grew from over half a dozen members initially to eventually over 300 people!
I lost a very, dear close friend recently who was single but led a very full life. She had many friends and it became apparent at her funeral that she had different "compartments" of friends that she had cultivated over the years: some from work. some from volunteering, some from an art group, some from a political group. There was a bit of a crossover but generally these were all friends from activities in to which she had time and effort. It takes commitment, saying yes to things you don't want to do sometimes, going out on cold dark nights when you would prefer to be at home, putting up with annoying people until you find the right ones for you, but you can do it op!
Why not draw a circular diagram with yourself at the middle of it, a bit like a cake, with various "slices" branching off from you in a circle? Then fill in the slices. One will be work. One will be health & fitness. One could be travel & holidays. Another, a particularly hobby. Another, ongoing education. And then attend to them in turn and put in a bit of effort in to each segment. And assess at the end of each month, then set realistic, small goals for the next month in each area.