Myself, I do not necessarily mind the solitude. Some of the best times of my life were those in which I was rarely in contact with others, sometimes only spending maybe 30 minutes around others a week. I lived in a remote house in the nature, and I spent many hours lost in music or in woodworking. It was a quiet, peaceful life.
Even once I eventually had to leave that house, I was still never a particularly 'social' person, not until the Internet came along. Once the internet was out, I was active. I was active everywhere, I was making friends left and right, playing video games with people (a hobby I had never partaken in before in serious measure) and having a very good time. I finally came out of my cocoon for the first time in twenty years.
It was that wild west period of the internet, in the late 90s and early 2000s. Back before social media, but we still had messenger clients and whatnot. Forums like this were prominent, and gaming communities were small but vibrant. I began to notice that as I became more social online, I did in the real world too. I knew my neighbors, I had friends at work, I hosted guests regularly for the first time, my social life was thriving. All because I had been given that first step online.
Eventually though it all faded. By now I'm practically back in that state of solitude I was 30-40 years ago. I have a few good friends, which I appreciate, but I do not see them often. I spend little time online these days, as I never quite adapted to social media, forums have reduced in relevance, and I stopped gaming. Most of my time is spent either working (with wood!) or listening to music on my own. Again. But this time, it does feel a little lonely. I enjoy peace and quiet, I was always someone who wanted to be left undisturbed, but in a way that is coming at a great detriment.
This is all to say that even though I never really used social media, I understand completely how the internet can make up for those connections you maybe didn't have in the real world, but never realized it. It is much more sobering to realize it once you've lost it, than before you had it. I likewise often find myself with thoughts or ideas I wish to express or discuss with others, but no place to do so anymore.
It hurts sometimes. But it does make for a splendid time for self-reflection, which is what I have gained out of this. Think about what matters, what truly matters. You may learn eventually that the forms of communication you had were not what you wanted anyway; a band-aid of sorts. Perhaps that is not the answer you desire, but it is an increasingly common one in the age of social media. I understand how you've come to feel this way. Excuse the massive post...