Hi Paul, I have done a reply but not sure if it got through - my first time on this site and a bit of a "grey surfer". Yes, I am going on this trip and have been with JY before, last time to New Zealand and the 3 weeks was not long enough. I have been to the Dolomites and it was beautiful if you like the scenery. I haven't been to Croatia before so that will be interesting. I have been a single traveller for nearly 7 years and get just as nervous every time but it doesn't take long to relax and the people I have met have all be friendly. I think the most important thing is to retain your sense of humour and "go with the flow". I am told there is about 26 of us so we should get on with someone! JY look after you very well and usually the hotels and trips are all very organised and if you are prepared to join in, there aren't any "lonely" moments but equally if you want spend time on your own, there are plenty of opportunities to do so but personally there is always lots to do and the time goes very quickly. I hope this helps.
Regards