Well, let me start off by saying that I know nothing about human psychology. So what you will write is just my opinion.
First off, I don't think you are a complete weirdo, jerk, or whatever you wanna name it. Thinking about 'what would life be IF' things are pretty much normal in my opinion. Sometimes I think about situations and their different outcomes, if I had changed my behaviour prior to that. (Though I have to say the potatoe story is kinda strange )
Also if you don't interact or don't WANT to interact with other people, that's fine too. Some people care more about their relations and other people are a bit of loners. Everything is fine.
And as you said, you are no threat to mankind or similar, you can move on with your life and as long as you are happy with it, I think it's fine.
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