I had kfc with bare hands few times and didn't wash my hands before that! should i be concerned of hepatitis a or anything bad like that?

No. Make it a habit.: One should wash one's hands before eating, as a habit. Even better, choose healthy food items and wash hands before eating. That means choosing the grilled instead of fried chicken at KFC. That means being only a tiny bit concerned, just enough to remind oneself to wash hands before eating (no more, no less). The same amount of concern goes for "looking both ways before crossing the street."