Welcome to the forum
@Lottiegrace .
Sorry to read about your diagnosis, but pleased that you have found the forum. Try to be patient and allow your team to work with you to bring your levels down gradually. Your body before diagnosis will have been used to very high glucose levels, and your body needs to adjust gradually as
@Kaylz has said.
Weirdly doing intense exercise can raise your glucose levels so don’t worry if that is not working at present.
What targets have you been given at present? If you are constantly above 10 at present you could contact your team and talk to them about changing your insulin doses. Which insulins are you using?
Another tool that you might want to ask them about is having half unit pens. In the early stages I found I needed very low doses of insulin and once you are carb counting and making decisions about the doses it is good to be able to work with half units. These used to be just for children (so mine came with nice stickers) and also in different colours.
Whatever questions arise for you know that there is a wealth of experience to tap into on here and no questions are considered silly.