Ben giriyorum is the correct one (present tense) ben girdin is the wrong one . Ben girdim would be the correct (past tense)

Please write the words or sentence you want to ask in English, becuase those two words have different meaning.

I enter the shop (I walk in to the shop) simple present tense = ben dukana girerim simple continues tense = ben dukana giriyorum simple past tense = ben dukana girdim