Why is my 6-month-old shelter cat scared? How can I help?

Thanks for using Petco Pet Education Center, formerly Petcoach! Cats, like people, have different personalities; some are very sociable and always want to cuddle, while others can be more reserved and independent. It may be partly personality contributing to his behavior, as well as adjusting to his new environment. A pheromone collar (they can be found on amazon, such as nurturecalm) may be a good option instead of feliway spray, as it is a continuous release for a full month. While the response is variable among cats, it is definitely something I would recommend giving a try. Additionally, if there is a type of treat that Vin really enjoys, I would recommend putting some down by you when you are sitting on the couch watching TV, etc. When he comes to eat them, don't force an interaction, but allow him to nibble on them and then decide where he wants to go. Over time, they can be moved closer and closer to you to encourage him to be more comfortable in close proximity. When he seems playful, play with him with a toy, etc and then allow him to leave when he is done. If he is on a feeding schedule, get his attention by opening a can or shaking food into his bowl, allow him to stand next to you and have a short interaction before you set it down. If he still seems uncomfortable after these suggestions, I would recommend either setting up a consult or reaching out to your regular veterinarian for further advice. Good luck!