It’s not just you. PSN is down for everyone.
PS3, PS4 owners have taken over social media to confirm the same. #psndown is trending over twitter in the U.S
PlayStation Network status page reads,
Gaming And Social services are down for PS3 and PS4 owners.You may have some difficulty launching games, applications or online features. Our engineers are working to resolve the issue as soon as possible, and we thank you for your patience. Read the status page.