I feel the same way, with a similar timeline. I'm also 37. I'm not sure when I began to feel hypersensitive because for many years I didn't characterize it as such. I've always been lonely, but I've also always felt that I had a perspective that was needed, just not appreciated. I'm now learning how to use my empathy by structuring it in a social approach. My mistake for many years was withdrawing as a result of a combination of loneliness due to my rare personality and childhood trauma. Over the past few years, I've been attempting to conceptualize people differently, and I've learned that human beings at root attempt to be paradoxical and end up becoming contradictions in terms. This goes for all of us, non-HSPs and HSPs, and any other category of human. Once you realize that, you can begin to look for patterns in behavior, fueled by your empathic abilities, and start navigating social life better. Granted, this is informed by my personal philosophy / beliefs / spirituality. However, I think it holds. And although it is useful to begin thinking of people this way, once you begin looking more inward, it can become disturbing as well, as you realize that you too are a contradiction. Empaths do have better potential to de-escalate human conflict, changing the terms from dichotomous (me against you) to ecologic (with overlapping interests), but turning the microscope on yourself is just painful. Even more odd is to consider that, given that most people are not particularly empathic, it's quite likely that people in general are not supposed to look inwardly too deeply. In fact, discussing issues with others, like we're doing here, is more likely to reduce our symptoms of loneliness, as compared to excessive introspection. This is why, once COVID is controlled in our respective locations, we need to go into our communities and interact face-to-face with people. This is especially true if you do too much navel gazing like I do.