How do writers come up with plots for stories?

When answering this question, please assume everything I’m saying is true. I know there are writers on Fluther who are just as good or superior to me.

I can write really good descriptions of places, time periods, historic events, descriptions of houses and towns and highways—both fiction and for regional nonfiction. I have credible detailed descriptions of fictional organizations, cults, businesses, missionary organizations, secret societies and secret law enforcement.

I can make up imaginary places and histories and integrate them with the history of the world. I’ve been doing this since I was ten or eleven.

I’m not saying these things to brag. Just to describe the following dilemma. I am not very good with plots for stories, and my description of people is very deficient and two-dimensional—probably because I am very non-social and most people are a complete mystery to me. I rarely engage or look people in the eye.

If you can help me with either of these problems, I would like to hear what you have to say. I write almost compulsively and I feel this one talent is going to waste because I cannot come up with plots and ideas for stories. Probably because I have never really engaged much with people.

My strengths are capturing the atmosphere and spirit of places I am interested in real-world settings that include the fantastical elements of historic conspiracies, that occasionally include local folklore, science fiction, and the supernatural (both angelic and horror).

Here I sit, writing compulsively but never coming up with any stories and my colorless descriptions of people. Everything else is good.

Thanks.