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Don't overlook the Auto subforum. 6 months is very short but it may be possible with unfavorable terms. That said, AAoA is what really matters and that's less than 6 months if you had a new card in December. Are those two credit cards the only credit accounts on your reports? We really can't guarantee things one way or another or tell you the APR you'd qualify for. We can only provide general info as we don't have the details of the underwriting critieria for auto loans with the various creditors out there. We can only guess that you'd be with a high rate if you could get approved.
An auto loan decision probably won't be based on the TU FICO 8 provided by Discover. Make sure you always consider the specific scoring model when referencing scores and consider the relevance of a given model/CRA combo to a given creditor/product. Not all creditors use TU. If your auto loan creditor uses one of the other CRA's then the report and the score generated based on that CRA's report data is what will matter.