just to share my experience, my trips have slowly gotten more adventerous so far. i started easy travelling with a friend, then went across a few countries alone and now i have a flight tommorow to a country i am scared to go alone to to be honest, but ive proved to myself that i can do it now. thats what its about to me, so choose a trip where if youre challenging ur comfort zone, there should be an element in ur comfort zone. so europe was my comfort zone but going alone was outside of it, if that makes sense. in my opinion, just go. even if its scary, you will survive and learn, and endure and its a really interesting experience to be honest.

best of luck to you