I have some mild learning disabilities and have a few of the symptoms you do. If you do have a definite diagnosis, your school most likely has resources to help you with remedial learning. I was diagnosed in college because my parents believed I "wasn't trying hard enough" and would not let me get tested. Anyhow, after a semester of weekly learning sessions and a bit of practice, I learned tips to help the day and tasks go by easier. JustLikeAPill- my mom has takes syntharoid too. She almost died because she wouldn't go to the doctor. I've seen the symptoms firsthand, and it can be awful without medication!
As for friends, I know it's very important especially at your age. Worry about yourself first, and the kind of friends you want will appear in due time. As you know, hobbies are really great and you have friends on this forum! As I sidenote, I was picked on a lot all the way from elementary school through high school. In college, I was considered to be weird but cool. Now I'm still the same person, and people think I'm pretty interesting and cool. There's no accounting for taste, it's a matter of who you surround yourself with!
Your diagnosis can be an excuse for things you can't do, or a place for you to start learning what you CAN do. Just realise that it takes time for results and getting used to whatever they're going to ask you to do (medication, remedial learning, etc). Chin up! Feel free to PM me if you want.