Talk to your doctor, ask your guidance counselor or a trusted teacher.  As a minor you will need your mom's consent for help, but you can start with these available knowledgeable people.  Go on line or search community help sites and see what is available to you in your community such as a mental health center. Most or many of these are charging clients on a sliding scale (meaning what you can afford).  It can work for you.  Unfortunately, there is nothing "normal" about autism let mom know what you have found.  Her insurance may in fact cover evaluations.

Wayne Yankus, MD, FAAP
expert panelist: pediatrics