I've never had a relationship and I think over 30 it's really hard to find one (especially if you never had one so don't have the "how to experience"). Everyone is either already married, or already divorced with kids, or just out of your league. The married part also has another effect: you won't get invited to a lot of events where people socialize, say a kids birthday party where the parents also come together.
Also I think it's a personal thing but I don't even try to make contact with anyone because of the whole climate of our society. Obviously it's divided and that's really bad on its own but I think about things like mansplaining. Basically you are reminded everywhere how bad it is and I agree on that but as an anxious person it makes even more less willing to make contact because I always have that thought of what if you are a doing something wrong, you will be accused of something etc.
Yeah reading back my comment doesnt really make any sense but... I feel that some people, some of us just meant to be forever alone for good or bad