I have Tourette's as well! Currently nearly 17 and ive been learning BSL since i was 14 and ive noticed that I've developed a LOT of tics that are sign haha
I started learning because i found it super interesting, but since have used it when i'm semi or non-verbal, when making jokes with my friends and when me and my girlfriend (they also have Tourette's so double chaos) talk because they have limited hearing and its funny when we see peoples heads turn when we go from pretty much silently signing to having a full blown verbal conversation haha
Hope you have fun in your journey learning!