Getting back into swimming?

You should just try it again. You might find if you start again that all the reasons you quit for cone back to you. There is no reason why you shouldnt start again besides the fact that it might be very hard to get back into it at the start. It's never to late to return to the sport and even people older than you return after years to do masters swimming. My advice would be to just go for it and try again. There's nothing stopping you besides the thoughts going through your head, and any coach worth training under would be happy to see someone giving the sport another shot.