Hi
@Lunar_Lapin I agree with
@Jkoko56 no one can force you to do this and you need to bear in mind that travel involves unpredictability so if you're not up for it then make the decision you feel most comfortable with.
There are things you can do though if you would like to go - and to be honest given the chance I would go, travelling is gaining life experience so meeting new folk, different circumstances, adapting and gaining confidence.
A frio is ideal for storing insulin if the temperature get's warm, however as you're only away for 13 days your insulin is fine for this, take 3 times the amount of diabetes stuff you need for the trip and keep everything in an easy to access handbag, along with plenty of glucose. See if your DSN will give you a libre for the trip as it lasts 14 days it's good for checking your levels as much as you need to and seeing which direction your BG is going, ideal for travel as you can prevent lows from occurring. Buddy up with someone for the trip who you trust, tell them what a hypo is so they know what to do if you go low and how to respond. Do some research, learn about where it is you are going and what type of food is enjoyed there, get to know carb values so you can easily work out your insulin doses. Flying can be made to be an issue if you let it, however the best way to conquer your demons is to face them and if you get the chance to fly do it, I know it's easy to tell someone this but if you let your anxiety stop you from flying then you will miss out on opportunities to see the world, lots of type 1's fly regularly and it's an incredibly safe way to travel so try to not think about this aspect, concentrate on the destination instead ?
I appreciate you have had some mental issues but with some support from those organising this, a buddy and an action plan of how you will manage your diabetes while you are away will give you more confidence about doing the trip, and think about the feeling of achievement in that you have been there, done that and hopefully bring home a t-shirt souvenir too !