help,, help,,, i created a 3d model of car, but something went wrong

I CREATED A 3D MODEL OF CAR, I ALWAYS LOOK TUTORIALS AND THEN CLOSE THEM AND TRY TO DO EVERYTHING ON MY OWN BUT THIS TIME I FORGOT TO ADD SUBSURF IN MY CAR MODEL WHICH MESSED UP MY MODEL , IN OBECT MODE THE MODEL LOOKS QUITE WELL. BUT WHEN I RENDER IT I SEE WEIRD SHARP EDGES IN WHOLE BODY OF CAR. IS THERE ANY SOLUTION?? I APPLIED SUB SURF NOW BUT IT BECOME EVEN MORE WEIRDER WHEN I ADD IT NOW. DO I HAVE TO BREAK ITS FACES AND MAKE IT AGAIN??? it took me 15 hours to make this and iam trying to fix it from hours but no use…should i give up and start a new model???

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one word, ngons.

so if i remove ngons and make quads in my whole model will it fix it???

if it wont then i better make new model…