Welcome to the forum
@annell and sorry to hear you are feeling so overwhelmed by your change of diagnosis.
It does take a bit of getting used to, but really type 1 is so much easier to have than type 2 - there is no worrying about what you can or can't eat, you can eat whatever you like! Over time you will learn what insulin you need for what foods and injecting will just be second nature instead of feeling like a chore. It sounds as though the doses they've put you on to start with (which will have been a best guess, and as
@Inka says they'll have erred on the side of caution) are a bit lower than they should be, so do contact your Diabetes Specialist Nurse and tell them that your readings after food are so high. Insulin doses need to be adjusted quite frequently and at first your DSN should be helping you with this, so make them do their job!
In normal weather you can just carry your Novorapid pen around with you in your bag, and you'll soon learn to guesstimate the carbs in any snack you want to eat when you're out so you can do a top-up dose for it if necessary. Some people have an app which helps with this (sorry I don't know which, don't have smartphone!).
If it's very hot you can get a Frio wallet from here -
https://friouk.com/ or from Diabetes UK shop, you soak them in water and put your pens in them and they keep the insulin cool without it getting too cold.