i have just finished a contiki tour thru europe where there were a number of singles were on our tour trust me after the 2nd day u wont need to worry about being alone youll have sevefral friends already and by the end of the first week youll be friends with your entire tour
good luck u will have an awesome time
I am doing the European Experience tour starting on 8 April. Thought that it was a bit more bang for buck.
Have you managed to secure your flights and are you booking through a local agent?