Heya
@Miss Chaima Welcome to the site
It's all alot to take in when you are first diagnosed, but it does get alot easier in time, the good thing is that you have been diagnosed and you are now taking insulin.
Best advice I can give any newly diagnosed is to start reading up as much as you can and become the expert on this, best book to get is 'Think like a pancreas' written specially for type 1's and available on Amazon.
As you are running high and on mixed insulin, can you cut down on the carbs a bit, as these are what will push your bood glucose levels higher, carbs are things like bread, biscuits, fruit, don't cut back too much, just a little at a time, as your still taking a fast acting insulin in your humalog mix 25. To help you understand carbs better can you download carbs and cals on your phone, it's an app which will show you carb content of food or use 'myfitnesspal' which is free. You will need to consult your doctor about increasing your doses. In the UK alot of type 1's use 2 different types of insulin - a quick acting such as Novorapid which is taken before meals and the dose is based on the amount of carbs being eaten, as well as a long acting insulin which covers the body's requirements over 24 hours. Some people are given mixed insulin to start with until they get used to taking insulin and then moved onto multiple daily injections once their knowledge in carbohydrates increases and they are confident in giving insulin for each mealtime based on the carbs eaten.
There is a wealth of knowledge here, so happy to help as much as you need, best wishes