How do i not make myself feel bad because i have a learning disability?

i'm 14 years old, i was born prematurely so i was told that my brain didn't develop enough and i have learning disabilities, i have a short attention span it's hard for me to comprehend and i forget how to count money and see how much money i will get back when a purchase something, i have most special ed classes, it makes me sad and feel bad for myself i starting crying..now what should i do to not feel this way ?