I felt happy reading your post, happy that you are 14 and looking for answers. I wish I had this info when I was fourteen, but hey, I can only go forward. I am 39 and I just started questioning this about me a couple of weeks ago and have been on a non-stop search for more answers since.
I have a Master’s Degree and I feel like a fraud because I don’t really understand how I managed to get there. A 2 year program took me 5 years to complete. My excuse was that I was really kind of “part time” and that I also worked part time. I also went on sick leave due to stress. My list of “failures” don’t end there. I was always the slowest at any job. If work ended at 4, I was there til 7 or 8 going over things, making sure I didn’t miss anything because I knew I made stupid mistakes sometimes and I really wanted to do well.
All this to say, if early testing can help you avoid this or something similar down the road, by all means get evaluated 
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I wish you the best of luck finding your answers. I will be looking for mine too
DD
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