Get an assessment done.
There are free screening tools online - I found the one at Genius Within was good. But I'm sure there are others.
You don't say how old you are. If you work ask yr HR department to arrange a Workbased Assessment. These can be funded by Access to Work. HR will know.
If you are at school/college talk to your tutor and your parents.
Other than that try a chat with your GP.
Good luck.