Testicular cancer??worried?

well lets start off im 13 and found out i had TC a year ago and never really looked it up cause o thought it was harmless and i have to get checkups every year so im really worried cuase in science cl my teacher siad that it can spread to other areas of the body so it been in my mind for the past month and now i decided to read about it and it said it can be fatal if untreated so wat im asking should i get more check ups and will i be fine and wat will they do to cure it or something??