Why can't i remember anything?

Well, let me tell you something about me. My name is Carl and i am 15 years old. I have lived in over 5 different places in my lifetime and i have a very hard time remembering anything. I know that i am dyslexic but im not sure if that can affect my memory. I have a hard time remembering what to do (example how to a math problem), user names, pwords and numbers. Here is an example i don't remember anything from my summer vacation, what i did over the summer, who i met, their names, or any other important information. I can remember somethings (example a 5 did git code for about 30 minutes be for i have no clue what the code was.) Here is another example i was a very good skateboarder until summer of 2009 when i forgot how to skateboard. Even if i try to remember/review/red/watch the tricks i just cant remember them. I don't know what to do.