Yeah, I feel the same way you do actually. I am in my early 20s and I already regret my life and I keep looking back and thinking, what if I had approached things in a slightly different way, because I am actually very very anti-social. I've always had this personality defect in me, but I always think, what if I had used the opportunities that I had in the past to connect with more people and to form meaningful relationships. I keep regretting my decisions and not being social enough.
It has affected me in a very negative way. I always think that because everyone has a girlfriend or they have more friends, they always have greater value and they live happier lives, but the fact is that this might not always be true, like we don't know what other people are going through in their lives. Someone might have lots of friends and girlfriends but they might be struggling with their careers, which is the opposite to your case. I've always been self-conscious about the fact that I am terrible at making friends, let alone talking to girls and seeing everyone else being successful in this aspect makes me feel upset and makes me feel like I am much worse than other people.
It is also important to remember that you can always change things. For example, you might want to try improving your conversation skills and putting yourself out there. You can try dating sites. I would recommend against this because for guys dating sites are far less beneficial and can have detrimental effect on your self-esteem and mental health because usually people always look at how you look on dating sites rather than their personality or their interests. That's just how these dating sites are, so I'd recommend have more frequent conversations with people in real-life for higher success, but you could still have a go.
Overall, my biggest tip to all of this is to NOT think about it. The more you think about this the more upset you're going to get. I am trying not to think about it too much because I don't want to be depressed about it. Be bold and be brave. Use as many opportunities as you can to talk to people and reach out to them. Especially since you're in your 30s, so I think you've got nothing to lose, so like, put yourself out there more and be very brave. If people don't want to talk to you that's on them. If people don't want to accept what you offer to them, that's on them and that's their problem. If you continue to keep going, try new things, challenge yourself and learn new skills you will eventually meet people who will like you in that way. Remember that everyone's different. I have reached out to quite a few girls in my life and every single one of them had a different mindset and different personality. Some girls ignored me, some girls were very talkative and some were shy and some were more confident. I think it is true that if you keep going and meet new people, eventually, you will come across the person/girl that will make time for you and like you. That's what I try to think and that's how I try to cure myself from my anti-social personality.