Hi and welcome. You feel normal because your body has gotten used to very high blood sugars. When your sugars come down, you will probably feel "low" for a while, but that will go away.
As for why it happened to you, it can happen to anyone. Type 1 has nothing to do with weight or eating habits. It is an autoimmune disorder (like Lupus or Rheumatoid arthritis) where your body accidentally attacks the insulin producing cells and kills them off. Your levels are still very high because you are not taking enough insulin yet. It takes some time to adjust the dosage and everyone is different. The docs will usually start you at a lower level and then work you up. I would strongly recommend reading "Think Like a Pancreas" and "Using Insulin" to learn more about how to take insulin properly.
What types of insulin are you taking and how often? It is important to learn to carb count and dose accordingly.
Hope this helps a bit. Feel free to ask lots of questions. If you are looking for a board with lots of type 1s, I would try either
Diabetes Daily or
Juvenation . This board is good, but there aren't a lot of us out there compared to type 2s.
Cora