Thank you for the help starting to feel a bit better. My only problem now is I would hate to get put on a ride with a family and feel like a third wheel to them. Don't want to ruin any ones experiance at Disney as I know for some people it is a once in a life time trip. I am going to sign up for the keys to the kingdom tour if that is what it is called the one that takes 5 hours around magic kingdom. Going to take my camera and go around every area take lots of pictures and do what I love doing best and that is just wandering and going to what ever catches my eye at the time. Just still feel kind of odd hoping on rides with other families. Peter pan is my favourite ride so that is one I will do with or with out anyone I don't care.
You sound a lot like me in that you seem to put an awful lot of thought into what others think of you. I did that up until recently when I finally realized that people just don't think about me all that much. I mean, when people plan their trips to Disney, they certainly aren't planning them with me in mind. And, I don't think anybody goes to Disney thinking they are going to have the place to themselves so by you getting paired on a ride with someone, I don't think you could ruin their trip.
I hope I don't bore anyone with my stories (see, there I go worrying about other people again). I went to Disney for the first time on my honeymoon. I am sure I had people seated next to me on some rides but I just didn't care. As long as I am not placed next to somebody who smells bad or throws up on me, I don't mind either way.
I have found that most people go to Disney are they want to have a good time. On my two solo trips I have had some nice conversations on buses, the monorail, waiting in line for Test Track. You have to remember that people do not know you are alone, unless you tell them. For all they know, you are on your honeymoon and your new wife is just afraid to go on that particular ride so you are going by yourself.
You have to ask yourself what you love about Disney. Do you love Disney because you want to make sure everyone else has a great time? For me, I love Disney, not only because it was my honeymoon destination (that's when I first fell in love with it) but because I have read a couple of Walt's biographies. I get inspiration from him, and WDW itself. He had people who didn't believe in him his whole life. They thought he was crazy. But, he believed in himself and as a result, look what he created. What he did has impacted billions of people around the world. I go and, regardless of what I do, I sit in awe of what one person can do when they believe in themself and set their mind to it. Not saying I could create the next Disney World but I know I am capable of more than I have done. Hopefully you get the point.
So, go and get the most out of the reason you love Disney. I also think it is a good thing you go by yourself. I also was very close with my wife. I also could do anything with her by my side. In a way, she was like my security blanket. Well, she told me a couple weeks after my trip last August, and shortly before my 40th birthday, that she wanted a divorce. I wish I had done more on my own throughout the marriage, just so I would have had the confidence in myself. Now I am pushing myself like I never did before determined not to let life pass me by like I did in the past.
To answer the question about the single rider line. What you heard about the Fast Track is correct. As far as other rides, not all have single rider lines but they work the same way. Its a Small World, Tower of Terror, Splash Mountain, and Rock and Roller Coaster. In each case I was in line and they had one spot left to fill. So, the CM called out for single riders. I raised my hand and was able to skip ahead in line drastically reducing my wait time in line. It was great.
Hopefully I didn't bore you too much.
I think families expect that they will be sharing space if there is some. Just say hi, My name is ____ and I love Disney and they will be fine 
So sometimes it's fun being seated with strangers. Other times they'll use a single rider to fill up the ride vehicle and you get to skip way ahead! 
