Is your cat totally indoors or you let it out sometimes?
I only let one out on a leash and accompanied by me the whole time. Other than that, they are full-time indoor.
I have tried to get mine to like the leash but they both detest it. I got my first when he was 9months and he was already an indoor boy. I tried him on the leash but he just wedged his head in my legs and wailed!

My girl is the same. I got her at 4 months and tried to get her out but she just didn't like it.

I have tried to persiveer but to no avail. They just panic and fret.
Currently my cats are indoor. I may change my mind though if I can build a nice enough enclosure for them to go out and be safe in.