That's a subjective question.
"if I could play bass" - I have days like that. Heeheehee, If you intend this to be more ornament than instrument, does it really matter?
If however you want to dabble, start with a medium set or a light/intermediate set if you feel that your fingers are soft. If you play often enough your finger strength and the toughness of your fingertips will improve. At that point you should ask the question again.
The nylon flats that I have were a little "grabby" at first but they were quick to bed down and feel slick. If you have tapewounds that feel abrasive I'd say they are faulty.