Anxiety? OCD? Depression? ADHD? Help?

Hey, my name's Jake. I'm 16 years old and people might say I have a great life. But ever since I could remember, my point of view on everything has been totally off. When I was little, I was always scared or anxious of doing new things and always had different, more fearful thoughts than everyone else. I recently found out, when I was in daycare as a little kid, I had serious hair loss because I was so stressed of being away from my mother. Growing up, I didn't stop wetting the bed until I was about 11. (I don't know if this has anything to do with anything, just thought I'd include it) I was treated for ADHD and had to take pills for a couple years. (Not on them anymore) A couple years later, 12 or 13 I had constant panic attacks started taking Zoloft for anxiety which helped my panic attacks a lot. Doc said it was alright to quit taking them. But anyways, what I'm trying to say is that this fearful anxiety has never left and hit even harder when I went through puberty. It's like I have this "voice" in my head that I can almost talk to. Like a conscious. It's nothing I can hear, it's just in my head. There isn't a day that goes by that my mind is not consumed by insecurity, stress, and obsessive thoughts. There is not reason for these emotions, they are just there, consuming my great life I want to have. I seem like a normal kid, I drive, go to parties, have a couple friends, and get girls just find. But I feel like I could be an amazing person if this thing was dealt with. I take Zoloft for anxiety, but I think there is way more to it than anxiety. My thoughts often feel "cloudy" and I get off track easily. I feel like this issue is holding me back from doing some fun things and having a great life. I used to be a real good student, but now my grades are dropping extremely. I often find myself looking in the mirror, it's like I have to. I don't know why, but I think it's me trying to find who I am. It's like I have no personality. When I see people, on the street, in school, I try to see my self as that person, I do this as a way to really see how un normal I am. I also always think myself as another person, and if I saw myself so I get a point of view of what I look like and act. I am way overly conscious of my looks. When ever I learn about a new disease, or disorder, I focus all my energy on that and I think I have it. I once convinced myself I was mentally retarded. I just wish I could be somewhat normal in the inside as everyone else. I know you're suppose to accept who you are, but I think this is something that needs to be dealt with. I have made some very good healthy choices by trying to eat right, working out, and even joined my school's football team in hope that I can be mentally healthy. It's helped a little, but this is driving me crazy and can't see myself living like this for more than another year. I have an appointment in about a month with the therapist. I was just wondering if anyone could give me a head start on all this. I tried to explain it as well as I could and any advise or information would be appreciated.