Welcome Deborah Batton.
Sorry to hear you have to join this board. Nearly everyone who gets type 1 diabetes is slim - and 20% of people diagnosed with type 2 diabetes are normal weight. I'm assuming from you stating type 1 that you have started on insulin and been introduced to blood glucose testing? Balancing insulin doses to all other factors - carbohydrate in, exercise / activity, stress, infection, weather etc is the challenge. Plus, in early days, most people experience the honeymoon effect, which means your pancreas continues to produce some insulin a bit irregularly.
Don't be too hard on yourself - and ask lots of questions, both here and to your diabetes team.