Hi Jadewoman! Welcome to the forum.
There is a "hitching a ride" section that you can post on later, once you know when you will be arriving at DIA. Oftentimes there are others who will be arriving around the same time who may already be renting a car and who may have room for another person/gear.
You have a lot of time to figure this all out, so don't worry about it. Things always work out the way they are supposed to.
Don't think that because you will be traveling by yourself that you will be alone at the festival. You will more than likely make a new friend or a hundred on this forum before you ever set foot in CO.
And, you will most certainly meet some wonderful folks once you get here, and you will find that it is easy to make friends with your neighbors, at the pickin' circles, on the tarps, at the workshops, basically everywhere.
Just read up on the topics on the forum and most any question you could have will already be answered.
Bring a smile and a positive attitude, and you will have an experience of a lifetime.