You would be in check
Why my pawn cant take the d4 knight?
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Specifically, you would be discovering check from the a5 bishop. Putting yourself in check is not allowed, so the c3 pawn is not allowed to move: it is "pinned" by the a5 bishop.
You are allowed to take the knight some other way: Qxd4 would be a good move here. You might also consider Pb4, which both unpins your c3 pawn and attacks the a5 bishop.
This happened in a recent game and im just wondering ¿why my c3 pawn can't take the knight? im really new to chess but i thought my pawn was a legal move, what i'm not seeing?