I'm pretty new at this myself and I think you have gotten a lot of good advise here already. Your fears are far from silly but you will be able to work through them, even if you need a little help doing so. I usually ride alone myself, and I would only like to add that it is a lot like doing most other things alone. You need to stay aware of your surroundings and use common sense. I feel safe enough riding around the neighborhood and on most roads without a lot of busy intersections, etc., but a couple of times I have found myself headed down roads that didn't feel safe to me, and I decided to change direction. When something just doesn't feel right, I listen to my instincts. I think you'll get more confident as you gain experience. You're willing to try, and that is the most important step.