I am somewhat a loner but do see the value of being in a group. I remember going abroad on holiday years ago with someone from work. It was pretty much a disaster between us as we found that we did not get on. It was one of those 18-30’s things so there was a group so the holiday was saved but I agree with Cassandra that the right group or people are important.
The most important thing about travelling is proably more about being streetwise and confident when travelling. There are a lot of conmen / women who prey on travellers, whether alone or in a group. There are mostly honest people too but it is not easy to distinguish between the two. I suppose it does depend quite a bit as to whether you are just looking around places or wanting to get a feel for the people and their lives too as guided tours really don’t get to the heart of that. For me, my love of people does limit the value of tour groups but I am (sadly) not going.
My advice is do your research Kitty and you will be more confident in what you do, hence enjoy it more. Good luck Kitty!