I can sypmathise with you completely ...I have only been riding two months and was worried about the cars/roundabouts/gears/clipless peddles etc etc ...I got some good advice that helped me start out. For a start I took the clipless peddles off for about 4 weeks (cost me $20 to replace) and just got used to the bike and the road and getting myself safely out and back home again. I also ride early in the mornings 5 - 5.30 am - less traffic so I feel more secure. I only ride later in the day or afternoons if I'm going with other people. I got abused by a rude driver one afternoon when I had only been riding a few weeks so that has still put me off. I am now much more assertive on the road and you will be too, just give yourself time.
I also went riding with someone more experienced who rode behind me telling which gear to be in & made me change more often than I was. Find someone who can help you with riding, most other bikers I know are more than happy to share their knowledge with you.
By the time I put the clipless peddles on I was more familiar with the bike so it was only the peddles that were new. I was told that I was overloading myself with too many new things at the one time and while I thought that may have been harsh .....it was true. After 8 weeks I'm competing in a bike leg of 40k's in a triathlon this weekend. You'll get there girl! Take it slow - soon you'll love it !! Good luck!