It's ok to feel anxious when thinking about riding, especially on roadways. One way I helped calm my nerves was riding frequently in low traffic areas. I commute to work and for fun and usually both involve riding in traffic now. Try to find low traffic areas and during low traffic times, to help you adjust. Also, find a group to ride with consistently. Riding with a group can help ease your nerves too and help with your bike handling skills.
Have a fun ride!!