I'm so confused.

I was diagnosed with type 1 on January 19th, 2009 when I was 15 years old. Diabetes does not run in my family - I'm the first to date. My mom and dad fed me right, I played sports, I've never been anywhere close to overweight. In fact, exactly the opposite. I almost struggle to keep the weight on. How did this happen? Should I ever choose to have kids, how likely is this disease to be passed on? I've come to terms with the condition and manage it accordingly, but it's taking a serious toll on me both physically and mentally, especially being in my mid-20's. I hate this quality of life, especially after living my first 15 years dietary restriction free. Even with all the doctors, therapists, endocrinologists that I've visited over the years, I still have an extremely tough time just chalking it up to "bad luck." Looking for someone with a similar story. Or just anyone. I'm at a loss. Have been for nearly a decade.