Could i possibly have dyslexia?

Im 19 and have just finished sixth form (college). I studied English Literature, Media Studies and Film Studies and got grade of B-C, so im not completely stupid. But sometimes i find it hard to read words, be they simple or long. Sometimes i just freeze and its like i have forgotten how to pronounce it. If i do just go ahead and say it when im not sure, sometimes im corrected by someone. When i read allowed i often stutter, because i get all mixed up with what im saying. Im not sure if its dyslexia? But i also noticed that when i write i often miss words out of sentences. I also find it hard to spell words sometimes. and when it comes to maths.... im lost to it. I have a hard time processing primary school math at times. Even from a young age until now, i just cant get it to click in my head. So im wondering, is it dyslexia? or am i just stupid? thanks