Pokerstars $0.15/$0.30 NLHE

Hero (~100bbs) is big blind with KK. UTG limps, CO (villain, ~100bbs) raises to 5.5bb, Hero reraises to 12bb. UTG folds, CO calls. Board comes out [Jc 8d 6c 3s Th]. Hero bets about half pot all streets to get stacks in, villain calls all streets. Is this overvaluing top pair? Brand new to these stakes, not sure how often villain shows up with AJ/KJ/QJ/QQ/FD here instead of a set or straight. Thought about checking turn but not many cards that scare me on the river so i was comfortable betting turn and barreling river with most cards. Thoughts?