I'm not personaly, at least for a while to come. Heck, maybe it'll even bring more support from our government to our own Navy to make sure we maintain our superiority, so in that light this could be one of the best things for our own navy in a long time.
China will have eventualy one refurbished soviet-era designed CV with two more cofirmed (and most likely) tweaked copies of that same decades-old design. Top it off that they haven't finished equiping them, have no trained or experienced carrier crews (although they're likely working on that as we speak), have no trained or experienced naval aviators, and don't even have a plane yet that can operate off them. I highly doubt it'll be a threat to our nation's current inventory of 11 CVs (not to mention the combined power of all our allies CVs), the brand spanking new ones currently being designed and developed to replace the older outdated designs, and our extremely experienced, tried and battle-hardened sailors and equipment.